diff --git a/packages/google-cloud-dialogflow/linkinator.config.json b/packages/google-cloud-dialogflow/linkinator.config.json
index 29a223b6db6..0121dfa684f 100644
--- a/packages/google-cloud-dialogflow/linkinator.config.json
+++ b/packages/google-cloud-dialogflow/linkinator.config.json
@@ -6,5 +6,5 @@
     "img.shields.io"
   ],
   "silent": true,
-  "concurrency": 10
+  "concurrency": 5
 }
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.delete_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.delete_agent.js
index eba49c9cccb..55d1dddf2e9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.delete_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.delete_agent.js
@@ -31,7 +31,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function deleteAgent() {
+  async function callDeleteAgent() {
     // Construct request
     const request = {
       parent,
@@ -42,7 +42,7 @@ function main(parent) {
     console.log(response);
   }
 
-  deleteAgent();
+  callDeleteAgent();
   // [END dialogflow_v2_generated_Agents_DeleteAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.export_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.export_agent.js
index b3daf997e0b..36a6227ddb7 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.export_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.export_agent.js
@@ -25,7 +25,7 @@ function main(parent, agentUri) {
    */
   // const parent = 'abc123'
   /**
-   *  Required. The [Google Cloud Storage](https://cloud.google.com/storage/docs/)
+   *  Required. The Google Cloud Storage (https://cloud.google.com/storage/docs/)
    *  URI to export the agent to.
    *  The format of this URI must be `gs://<bucket-name>/<object-name>`.
    *  If left unspecified, the serialized agent is returned inline.
@@ -38,7 +38,7 @@ function main(parent, agentUri) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function exportAgent() {
+  async function callExportAgent() {
     // Construct request
     const request = {
       parent,
@@ -51,7 +51,7 @@ function main(parent, agentUri) {
     console.log(response);
   }
 
-  exportAgent();
+  callExportAgent();
   // [END dialogflow_v2_generated_Agents_ExportAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.get_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.get_agent.js
index 07fceb7e298..aca7916657a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.get_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.get_agent.js
@@ -31,7 +31,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function getAgent() {
+  async function callGetAgent() {
     // Construct request
     const request = {
       parent,
@@ -42,7 +42,7 @@ function main(parent) {
     console.log(response);
   }
 
-  getAgent();
+  callGetAgent();
   // [END dialogflow_v2_generated_Agents_GetAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.get_validation_result.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.get_validation_result.js
index 60c0b7ffaf2..a62d1d60ede 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.get_validation_result.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.get_validation_result.js
@@ -26,8 +26,8 @@ function main(parent) {
   // const parent = 'abc123'
   /**
    *  Optional. The language for which you want a validation result. If not
-   *  specified, the agent's default language is used. [Many
-   *  languages](https://cloud.google.com/dialogflow/docs/reference/language)
+   *  specified, the agent's default language is used. Many
+   *  languages (https://cloud.google.com/dialogflow/docs/reference/language)
    *  are supported. Note: languages must be enabled in the agent before they can
    *  be used.
    */
@@ -39,7 +39,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function getValidationResult() {
+  async function callGetValidationResult() {
     // Construct request
     const request = {
       parent,
@@ -50,7 +50,7 @@ function main(parent) {
     console.log(response);
   }
 
-  getValidationResult();
+  callGetValidationResult();
   // [END dialogflow_v2_generated_Agents_GetValidationResult_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.import_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.import_agent.js
index fd6b44d947b..304cd31de62 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.import_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.import_agent.js
@@ -40,7 +40,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function importAgent() {
+  async function callImportAgent() {
     // Construct request
     const request = {
       parent,
@@ -52,7 +52,7 @@ function main(parent) {
     console.log(response);
   }
 
-  importAgent();
+  callImportAgent();
   // [END dialogflow_v2_generated_Agents_ImportAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.restore_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.restore_agent.js
index 62d6f5c1f2b..6ffb4f88499 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.restore_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.restore_agent.js
@@ -40,7 +40,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function restoreAgent() {
+  async function callRestoreAgent() {
     // Construct request
     const request = {
       parent,
@@ -52,7 +52,7 @@ function main(parent) {
     console.log(response);
   }
 
-  restoreAgent();
+  callRestoreAgent();
   // [END dialogflow_v2_generated_Agents_RestoreAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.search_agents.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.search_agents.js
index cc35d530fe3..67698d11409 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.search_agents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.search_agents.js
@@ -40,7 +40,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function searchAgents() {
+  async function callSearchAgents() {
     // Construct request
     const request = {
       parent,
@@ -53,7 +53,7 @@ function main(parent) {
     }
   }
 
-  searchAgents();
+  callSearchAgents();
   // [END dialogflow_v2_generated_Agents_SearchAgents_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.set_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.set_agent.js
index 1b868989019..71ab250d1d2 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.set_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.set_agent.js
@@ -22,11 +22,11 @@ function main(agent) {
   /**
    *  Required. The agent to update.
    */
-  // const agent = ''
+  // const agent = {}
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {AgentsClient} = require('@google-cloud/dialogflow').v2;
@@ -34,7 +34,7 @@ function main(agent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function setAgent() {
+  async function callSetAgent() {
     // Construct request
     const request = {
       agent,
@@ -45,7 +45,7 @@ function main(agent) {
     console.log(response);
   }
 
-  setAgent();
+  callSetAgent();
   // [END dialogflow_v2_generated_Agents_SetAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/agents.train_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2/agents.train_agent.js
index 633ce3aca6c..320d8b08cae 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/agents.train_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/agents.train_agent.js
@@ -31,7 +31,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function trainAgent() {
+  async function callTrainAgent() {
     // Construct request
     const request = {
       parent,
@@ -43,7 +43,7 @@ function main(parent) {
     console.log(response);
   }
 
-  trainAgent();
+  callTrainAgent();
   // [END dialogflow_v2_generated_Agents_TrainAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/answer_records.list_answer_records.js b/packages/google-cloud-dialogflow/samples/generated/v2/answer_records.list_answer_records.js
index 1bb997b293f..25ce565d711 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/answer_records.list_answer_records.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/answer_records.list_answer_records.js
@@ -30,7 +30,7 @@ function main(parent, filter) {
    *  Filter on answer record type. Currently predicates on `type` is supported,
    *  valid values are `ARTICLE_ANSWER`, `FAQ_ANSWER`.
    *  For more information about filtering, see
-   *  [API Filtering](https://aip.dev/160).
+   *  API Filtering (https://aip.dev/160).
    */
   // const filter = 'abc123'
   /**
@@ -41,7 +41,7 @@ function main(parent, filter) {
   // const pageSize = 1234
   /**
    *  Optional. The
-   *  [ListAnswerRecordsResponse.next_page_token][google.cloud.dialogflow.v2.ListAnswerRecordsResponse.next_page_token]
+   *  ListAnswerRecordsResponse.next_page_token google.cloud.dialogflow.v2.ListAnswerRecordsResponse.next_page_token
    *  value returned from a previous list request used to continue listing on
    *  the next page.
    */
@@ -53,7 +53,7 @@ function main(parent, filter) {
   // Instantiates a client
   const dialogflowClient = new AnswerRecordsClient();
 
-  async function listAnswerRecords() {
+  async function callListAnswerRecords() {
     // Construct request
     const request = {
       parent,
@@ -67,7 +67,7 @@ function main(parent, filter) {
     }
   }
 
-  listAnswerRecords();
+  callListAnswerRecords();
   // [END dialogflow_v2_generated_AnswerRecords_ListAnswerRecords_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/answer_records.update_answer_record.js b/packages/google-cloud-dialogflow/samples/generated/v2/answer_records.update_answer_record.js
index 74ce76e00ce..a9500622693 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/answer_records.update_answer_record.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/answer_records.update_answer_record.js
@@ -22,11 +22,11 @@ function main(answerRecord, updateMask) {
   /**
    *  Required. Answer record to update.
    */
-  // const answerRecord = ''
+  // const answerRecord = {}
   /**
    *  Required. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {AnswerRecordsClient} = require('@google-cloud/dialogflow').v2;
@@ -34,7 +34,7 @@ function main(answerRecord, updateMask) {
   // Instantiates a client
   const dialogflowClient = new AnswerRecordsClient();
 
-  async function updateAnswerRecord() {
+  async function callUpdateAnswerRecord() {
     // Construct request
     const request = {
       answerRecord,
@@ -46,7 +46,7 @@ function main(answerRecord, updateMask) {
     console.log(response);
   }
 
-  updateAnswerRecord();
+  callUpdateAnswerRecord();
   // [END dialogflow_v2_generated_AnswerRecords_UpdateAnswerRecord_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.create_context.js b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.create_context.js
index 1d0563ef20e..290d28ca11d 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.create_context.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.create_context.js
@@ -31,7 +31,7 @@ function main(parent, context) {
   /**
    *  Required. The context to create.
    */
-  // const context = ''
+  // const context = {}
 
   // Imports the Dialogflow library
   const {ContextsClient} = require('@google-cloud/dialogflow').v2;
@@ -39,7 +39,7 @@ function main(parent, context) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function createContext() {
+  async function callCreateContext() {
     // Construct request
     const request = {
       parent,
@@ -51,7 +51,7 @@ function main(parent, context) {
     console.log(response);
   }
 
-  createContext();
+  callCreateContext();
   // [END dialogflow_v2_generated_Contexts_CreateContext_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.delete_all_contexts.js b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.delete_all_contexts.js
index aeb652023cf..d6fedf751e5 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.delete_all_contexts.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.delete_all_contexts.js
@@ -35,7 +35,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function deleteAllContexts() {
+  async function callDeleteAllContexts() {
     // Construct request
     const request = {
       parent,
@@ -46,7 +46,7 @@ function main(parent) {
     console.log(response);
   }
 
-  deleteAllContexts();
+  callDeleteAllContexts();
   // [END dialogflow_v2_generated_Contexts_DeleteAllContexts_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.delete_context.js b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.delete_context.js
index 97befd50a11..a8f57d6e8b2 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.delete_context.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.delete_context.js
@@ -35,7 +35,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function deleteContext() {
+  async function callDeleteContext() {
     // Construct request
     const request = {
       name,
@@ -46,7 +46,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteContext();
+  callDeleteContext();
   // [END dialogflow_v2_generated_Contexts_DeleteContext_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.get_context.js b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.get_context.js
index 62f9e8f015b..12316dc3259 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.get_context.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.get_context.js
@@ -35,7 +35,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function getContext() {
+  async function callGetContext() {
     // Construct request
     const request = {
       name,
@@ -46,7 +46,7 @@ function main(name) {
     console.log(response);
   }
 
-  getContext();
+  callGetContext();
   // [END dialogflow_v2_generated_Contexts_GetContext_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.list_contexts.js b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.list_contexts.js
index 85eb7123c53..3f41abee442 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.list_contexts.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.list_contexts.js
@@ -44,7 +44,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function listContexts() {
+  async function callListContexts() {
     // Construct request
     const request = {
       parent,
@@ -57,7 +57,7 @@ function main(parent) {
     }
   }
 
-  listContexts();
+  callListContexts();
   // [END dialogflow_v2_generated_Contexts_ListContexts_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.update_context.js b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.update_context.js
index d52c2f8bbd7..64372bd0e61 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/contexts.update_context.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/contexts.update_context.js
@@ -22,11 +22,11 @@ function main(context) {
   /**
    *  Required. The context to update.
    */
-  // const context = ''
+  // const context = {}
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {ContextsClient} = require('@google-cloud/dialogflow').v2;
@@ -34,7 +34,7 @@ function main(context) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function updateContext() {
+  async function callUpdateContext() {
     // Construct request
     const request = {
       context,
@@ -45,7 +45,7 @@ function main(context) {
     console.log(response);
   }
 
-  updateContext();
+  callUpdateContext();
   // [END dialogflow_v2_generated_Contexts_UpdateContext_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.create_conversation_profile.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.create_conversation_profile.js
index f97b1708c78..8fb7fff477a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.create_conversation_profile.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.create_conversation_profile.js
@@ -27,7 +27,7 @@ function main(parent, conversationProfile) {
   /**
    *  Required. The conversation profile to create.
    */
-  // const conversationProfile = ''
+  // const conversationProfile = {}
 
   // Imports the Dialogflow library
   const {ConversationProfilesClient} = require('@google-cloud/dialogflow').v2;
@@ -35,7 +35,7 @@ function main(parent, conversationProfile) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function createConversationProfile() {
+  async function callCreateConversationProfile() {
     // Construct request
     const request = {
       parent,
@@ -47,7 +47,7 @@ function main(parent, conversationProfile) {
     console.log(response);
   }
 
-  createConversationProfile();
+  callCreateConversationProfile();
   // [END dialogflow_v2_generated_ConversationProfiles_CreateConversationProfile_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.delete_conversation_profile.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.delete_conversation_profile.js
index 65db7c8f8bb..799539bfac7 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.delete_conversation_profile.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.delete_conversation_profile.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function deleteConversationProfile() {
+  async function callDeleteConversationProfile() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteConversationProfile();
+  callDeleteConversationProfile();
   // [END dialogflow_v2_generated_ConversationProfiles_DeleteConversationProfile_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.get_conversation_profile.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.get_conversation_profile.js
index e112e35e1a8..49e0f4ac905 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.get_conversation_profile.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.get_conversation_profile.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function getConversationProfile() {
+  async function callGetConversationProfile() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getConversationProfile();
+  callGetConversationProfile();
   // [END dialogflow_v2_generated_ConversationProfiles_GetConversationProfile_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.list_conversation_profiles.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.list_conversation_profiles.js
index 8ad5b4249a9..4800a1b563a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.list_conversation_profiles.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.list_conversation_profiles.js
@@ -40,7 +40,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function listConversationProfiles() {
+  async function callListConversationProfiles() {
     // Construct request
     const request = {
       parent,
@@ -55,7 +55,7 @@ function main(parent) {
     }
   }
 
-  listConversationProfiles();
+  callListConversationProfiles();
   // [END dialogflow_v2_generated_ConversationProfiles_ListConversationProfiles_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.update_conversation_profile.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.update_conversation_profile.js
index 85bce09fd8f..13d5a7bb193 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.update_conversation_profile.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversation_profiles.update_conversation_profile.js
@@ -22,11 +22,11 @@ function main(conversationProfile, updateMask) {
   /**
    *  Required. The conversation profile to update.
    */
-  // const conversationProfile = ''
+  // const conversationProfile = {}
   /**
    *  Required. The mask to control which fields to update.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {ConversationProfilesClient} = require('@google-cloud/dialogflow').v2;
@@ -34,7 +34,7 @@ function main(conversationProfile, updateMask) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function updateConversationProfile() {
+  async function callUpdateConversationProfile() {
     // Construct request
     const request = {
       conversationProfile,
@@ -46,7 +46,7 @@ function main(conversationProfile, updateMask) {
     console.log(response);
   }
 
-  updateConversationProfile();
+  callUpdateConversationProfile();
   // [END dialogflow_v2_generated_ConversationProfiles_UpdateConversationProfile_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.complete_conversation.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.complete_conversation.js
index f84f76412bb..4d213af251e 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.complete_conversation.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.complete_conversation.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function completeConversation() {
+  async function callCompleteConversation() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  completeConversation();
+  callCompleteConversation();
   // [END dialogflow_v2_generated_Conversations_CompleteConversation_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.create_conversation.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.create_conversation.js
index 0e0ee8c8a85..62d670d9f32 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.create_conversation.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.create_conversation.js
@@ -27,13 +27,13 @@ function main(parent, conversation) {
   /**
    *  Required. The conversation to create.
    */
-  // const conversation = ''
+  // const conversation = {}
   /**
    *  Optional. Identifier of the conversation. Generally it's auto generated by Google.
    *  Only set it if you cannot wait for the response to return a
    *  auto-generated one to you.
    *  The conversation ID must be compliant with the regression fomula
-   *  "[a-zA-Z][a-zA-Z0-9_-]*" with the characters length in range of [3,64].
+   *  "a-zA-Z a-zA-Z0-9_-*" with the characters length in range of 3,64.
    *  If the field is provided, the caller is resposible for
    *  1. the uniqueness of the ID, otherwise the request will be rejected.
    *  2. the consistency for whether to use custom ID or not under a project to
@@ -47,7 +47,7 @@ function main(parent, conversation) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function createConversation() {
+  async function callCreateConversation() {
     // Construct request
     const request = {
       parent,
@@ -59,7 +59,7 @@ function main(parent, conversation) {
     console.log(response);
   }
 
-  createConversation();
+  callCreateConversation();
   // [END dialogflow_v2_generated_Conversations_CreateConversation_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.get_conversation.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.get_conversation.js
index 3c1075007e4..d4336c89c5a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.get_conversation.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.get_conversation.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function getConversation() {
+  async function callGetConversation() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getConversation();
+  callGetConversation();
   // [END dialogflow_v2_generated_Conversations_GetConversation_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.list_conversations.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.list_conversations.js
index ca3c05e7f6e..cf6676c453c 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.list_conversations.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.list_conversations.js
@@ -48,7 +48,7 @@ function main(parent) {
    *  the following expression only returns `COMPLETED` conversations:
    *  `lifecycle_state = "COMPLETED"`
    *  For more information about filtering, see
-   *  [API Filtering](https://aip.dev/160).
+   *  API Filtering (https://aip.dev/160).
    */
   // const filter = 'abc123'
 
@@ -58,7 +58,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function listConversations() {
+  async function callListConversations() {
     // Construct request
     const request = {
       parent,
@@ -71,7 +71,7 @@ function main(parent) {
     }
   }
 
-  listConversations();
+  callListConversations();
   // [END dialogflow_v2_generated_Conversations_ListConversations_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.list_messages.js b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.list_messages.js
index 42e73e8a99f..3aaf0c027ac 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/conversations.list_messages.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/conversations.list_messages.js
@@ -32,7 +32,7 @@ function main(parent) {
    *  `create_time_epoch_microseconds > 1551790877964485` or
    *  `create_time > 2017-01-15T01:30:15.01Z`.
    *  For more information about filtering, see
-   *  [API Filtering](https://aip.dev/160).
+   *  API Filtering (https://aip.dev/160).
    */
   // const filter = 'abc123'
   /**
@@ -51,7 +51,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function listMessages() {
+  async function callListMessages() {
     // Construct request
     const request = {
       parent,
@@ -64,7 +64,7 @@ function main(parent) {
     }
   }
 
-  listMessages();
+  callListMessages();
   // [END dialogflow_v2_generated_Conversations_ListMessages_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/documents.create_document.js b/packages/google-cloud-dialogflow/samples/generated/v2/documents.create_document.js
index 299c1267d65..315b9fd4981 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/documents.create_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/documents.create_document.js
@@ -28,7 +28,7 @@ function main(parent, document) {
   /**
    *  Required. The document to create.
    */
-  // const document = ''
+  // const document = {}
 
   // Imports the Dialogflow library
   const {DocumentsClient} = require('@google-cloud/dialogflow').v2;
@@ -36,7 +36,7 @@ function main(parent, document) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function createDocument() {
+  async function callCreateDocument() {
     // Construct request
     const request = {
       parent,
@@ -49,7 +49,7 @@ function main(parent, document) {
     console.log(response);
   }
 
-  createDocument();
+  callCreateDocument();
   // [END dialogflow_v2_generated_Documents_CreateDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/documents.delete_document.js b/packages/google-cloud-dialogflow/samples/generated/v2/documents.delete_document.js
index 251cc2c9b72..706f4a33747 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/documents.delete_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/documents.delete_document.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function deleteDocument() {
+  async function callDeleteDocument() {
     // Construct request
     const request = {
       name,
@@ -44,7 +44,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteDocument();
+  callDeleteDocument();
   // [END dialogflow_v2_generated_Documents_DeleteDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/documents.get_document.js b/packages/google-cloud-dialogflow/samples/generated/v2/documents.get_document.js
index 8e616221985..e287b51f02c 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/documents.get_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/documents.get_document.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function getDocument() {
+  async function callGetDocument() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getDocument();
+  callGetDocument();
   // [END dialogflow_v2_generated_Documents_GetDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/documents.list_documents.js b/packages/google-cloud-dialogflow/samples/generated/v2/documents.list_documents.js
index c67a9ad8aec..1a9415f87ba 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/documents.list_documents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/documents.list_documents.js
@@ -41,7 +41,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function listDocuments() {
+  async function callListDocuments() {
     // Construct request
     const request = {
       parent,
@@ -54,7 +54,7 @@ function main(parent) {
     }
   }
 
-  listDocuments();
+  callListDocuments();
   // [END dialogflow_v2_generated_Documents_ListDocuments_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/documents.reload_document.js b/packages/google-cloud-dialogflow/samples/generated/v2/documents.reload_document.js
index 07dcaab6381..33711f9f8ad 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/documents.reload_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/documents.reload_document.js
@@ -39,7 +39,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function reloadDocument() {
+  async function callReloadDocument() {
     // Construct request
     const request = {
       name,
@@ -51,7 +51,7 @@ function main(name) {
     console.log(response);
   }
 
-  reloadDocument();
+  callReloadDocument();
   // [END dialogflow_v2_generated_Documents_ReloadDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/documents.update_document.js b/packages/google-cloud-dialogflow/samples/generated/v2/documents.update_document.js
index c7cf16cb2a8..619e5665bf9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/documents.update_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/documents.update_document.js
@@ -22,13 +22,13 @@ function main(document) {
   /**
    *  Required. The document to update.
    */
-  // const document = ''
+  // const document = {}
   /**
    *  Optional. Not specified means `update all`.
    *  Currently, only `display_name` can be updated, an InvalidArgument will be
    *  returned for attempting to update other fields.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {DocumentsClient} = require('@google-cloud/dialogflow').v2;
@@ -36,7 +36,7 @@ function main(document) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function updateDocument() {
+  async function callUpdateDocument() {
     // Construct request
     const request = {
       document,
@@ -48,7 +48,7 @@ function main(document) {
     console.log(response);
   }
 
-  updateDocument();
+  callUpdateDocument();
   // [END dialogflow_v2_generated_Documents_UpdateDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_create_entities.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_create_entities.js
index 764aa4fdf99..233fd7d1d71 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_create_entities.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_create_entities.js
@@ -32,8 +32,8 @@ function main(parent, entities) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
 
@@ -43,7 +43,7 @@ function main(parent, entities) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchCreateEntities() {
+  async function callBatchCreateEntities() {
     // Construct request
     const request = {
       parent,
@@ -56,7 +56,7 @@ function main(parent, entities) {
     console.log(response);
   }
 
-  batchCreateEntities();
+  callBatchCreateEntities();
   // [END dialogflow_v2_generated_EntityTypes_BatchCreateEntities_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_delete_entities.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_delete_entities.js
index 67f65fe1a7a..14606347a73 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_delete_entities.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_delete_entities.js
@@ -34,8 +34,8 @@ function main(parent, entityValues) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
 
@@ -45,7 +45,7 @@ function main(parent, entityValues) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchDeleteEntities() {
+  async function callBatchDeleteEntities() {
     // Construct request
     const request = {
       parent,
@@ -58,7 +58,7 @@ function main(parent, entityValues) {
     console.log(response);
   }
 
-  batchDeleteEntities();
+  callBatchDeleteEntities();
   // [END dialogflow_v2_generated_EntityTypes_BatchDeleteEntities_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_delete_entity_types.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_delete_entity_types.js
index 6bd8fedddfd..3c5c1be9249 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_delete_entity_types.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_delete_entity_types.js
@@ -36,7 +36,7 @@ function main(parent, entityTypeNames) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchDeleteEntityTypes() {
+  async function callBatchDeleteEntityTypes() {
     // Construct request
     const request = {
       parent,
@@ -49,7 +49,7 @@ function main(parent, entityTypeNames) {
     console.log(response);
   }
 
-  batchDeleteEntityTypes();
+  callBatchDeleteEntityTypes();
   // [END dialogflow_v2_generated_EntityTypes_BatchDeleteEntityTypes_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_update_entities.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_update_entities.js
index e9cadb2a1fb..09adaa244c9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_update_entities.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_update_entities.js
@@ -32,14 +32,14 @@ function main(parent, entities) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {EntityTypesClient} = require('@google-cloud/dialogflow').v2;
@@ -47,7 +47,7 @@ function main(parent, entities) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchUpdateEntities() {
+  async function callBatchUpdateEntities() {
     // Construct request
     const request = {
       parent,
@@ -60,7 +60,7 @@ function main(parent, entities) {
     console.log(response);
   }
 
-  batchUpdateEntities();
+  callBatchUpdateEntities();
   // [END dialogflow_v2_generated_EntityTypes_BatchUpdateEntities_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_update_entity_types.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_update_entity_types.js
index b6433d71a1a..5a71bf5e242 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_update_entity_types.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.batch_update_entity_types.js
@@ -34,19 +34,19 @@ function main(parent) {
   /**
    *  The collection of entity types to update or create.
    */
-  // const entityTypeBatchInline = ''
+  // const entityTypeBatchInline = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {EntityTypesClient} = require('@google-cloud/dialogflow').v2;
@@ -54,7 +54,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchUpdateEntityTypes() {
+  async function callBatchUpdateEntityTypes() {
     // Construct request
     const request = {
       parent,
@@ -66,7 +66,7 @@ function main(parent) {
     console.log(response);
   }
 
-  batchUpdateEntityTypes();
+  callBatchUpdateEntityTypes();
   // [END dialogflow_v2_generated_EntityTypes_BatchUpdateEntityTypes_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.create_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.create_entity_type.js
index ace0b0cbe18..3a7cb1c51a2 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.create_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.create_entity_type.js
@@ -27,13 +27,13 @@ function main(parent, entityType) {
   /**
    *  Required. The entity type to create.
    */
-  // const entityType = ''
+  // const entityType = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
 
@@ -43,7 +43,7 @@ function main(parent, entityType) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function createEntityType() {
+  async function callCreateEntityType() {
     // Construct request
     const request = {
       parent,
@@ -55,7 +55,7 @@ function main(parent, entityType) {
     console.log(response);
   }
 
-  createEntityType();
+  callCreateEntityType();
   // [END dialogflow_v2_generated_EntityTypes_CreateEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.delete_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.delete_entity_type.js
index 9916c069c17..bad8a9cf1ad 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.delete_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.delete_entity_type.js
@@ -31,7 +31,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function deleteEntityType() {
+  async function callDeleteEntityType() {
     // Construct request
     const request = {
       name,
@@ -42,7 +42,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteEntityType();
+  callDeleteEntityType();
   // [END dialogflow_v2_generated_EntityTypes_DeleteEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.get_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.get_entity_type.js
index 00aa5d6f3b1..15830f98ff4 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.get_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.get_entity_type.js
@@ -28,8 +28,8 @@ function main(name) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
 
@@ -39,7 +39,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function getEntityType() {
+  async function callGetEntityType() {
     // Construct request
     const request = {
       name,
@@ -50,7 +50,7 @@ function main(name) {
     console.log(response);
   }
 
-  getEntityType();
+  callGetEntityType();
   // [END dialogflow_v2_generated_EntityTypes_GetEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.list_entity_types.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.list_entity_types.js
index 5643c5f3276..0def1062e69 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.list_entity_types.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.list_entity_types.js
@@ -28,8 +28,8 @@ function main(parent) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
@@ -48,7 +48,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function listEntityTypes() {
+  async function callListEntityTypes() {
     // Construct request
     const request = {
       parent,
@@ -61,7 +61,7 @@ function main(parent) {
     }
   }
 
-  listEntityTypes();
+  callListEntityTypes();
   // [END dialogflow_v2_generated_EntityTypes_ListEntityTypes_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.update_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.update_entity_type.js
index 728e35bd726..76a60bad856 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.update_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/entity_types.update_entity_type.js
@@ -22,19 +22,19 @@ function main(entityType) {
   /**
    *  Required. The entity type to update.
    */
-  // const entityType = ''
+  // const entityType = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {EntityTypesClient} = require('@google-cloud/dialogflow').v2;
@@ -42,7 +42,7 @@ function main(entityType) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function updateEntityType() {
+  async function callUpdateEntityType() {
     // Construct request
     const request = {
       entityType,
@@ -53,7 +53,7 @@ function main(entityType) {
     console.log(response);
   }
 
-  updateEntityType();
+  callUpdateEntityType();
   // [END dialogflow_v2_generated_EntityTypes_UpdateEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/environments.create_environment.js b/packages/google-cloud-dialogflow/samples/generated/v2/environments.create_environment.js
index e72bc7823bd..43b9d7075d5 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/environments.create_environment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/environments.create_environment.js
@@ -29,7 +29,7 @@ function main(parent, environment, environmentId) {
   /**
    *  Required. The environment to create.
    */
-  // const environment = ''
+  // const environment = {}
   /**
    *  Required. The unique id of the new environment.
    */
@@ -41,7 +41,7 @@ function main(parent, environment, environmentId) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function createEnvironment() {
+  async function callCreateEnvironment() {
     // Construct request
     const request = {
       parent,
@@ -54,7 +54,7 @@ function main(parent, environment, environmentId) {
     console.log(response);
   }
 
-  createEnvironment();
+  callCreateEnvironment();
   // [END dialogflow_v2_generated_Environments_CreateEnvironment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/environments.delete_environment.js b/packages/google-cloud-dialogflow/samples/generated/v2/environments.delete_environment.js
index d641c537115..57b0b6fac83 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/environments.delete_environment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/environments.delete_environment.js
@@ -35,7 +35,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function deleteEnvironment() {
+  async function callDeleteEnvironment() {
     // Construct request
     const request = {
       name,
@@ -46,7 +46,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteEnvironment();
+  callDeleteEnvironment();
   // [END dialogflow_v2_generated_Environments_DeleteEnvironment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/environments.get_environment.js b/packages/google-cloud-dialogflow/samples/generated/v2/environments.get_environment.js
index d7574bb14b0..a3666fd87b9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/environments.get_environment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/environments.get_environment.js
@@ -35,7 +35,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function getEnvironment() {
+  async function callGetEnvironment() {
     // Construct request
     const request = {
       name,
@@ -46,7 +46,7 @@ function main(name) {
     console.log(response);
   }
 
-  getEnvironment();
+  callGetEnvironment();
   // [END dialogflow_v2_generated_Environments_GetEnvironment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/environments.get_environment_history.js b/packages/google-cloud-dialogflow/samples/generated/v2/environments.get_environment_history.js
index c1d5dcd1d9a..a12bed7d4f0 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/environments.get_environment_history.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/environments.get_environment_history.js
@@ -44,7 +44,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function getEnvironmentHistory() {
+  async function callGetEnvironmentHistory() {
     // Construct request
     const request = {
       parent,
@@ -57,7 +57,7 @@ function main(parent) {
     }
   }
 
-  getEnvironmentHistory();
+  callGetEnvironmentHistory();
   // [END dialogflow_v2_generated_Environments_GetEnvironmentHistory_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/environments.list_environments.js b/packages/google-cloud-dialogflow/samples/generated/v2/environments.list_environments.js
index 4993af6c4d8..3555206ac6e 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/environments.list_environments.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/environments.list_environments.js
@@ -42,7 +42,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function listEnvironments() {
+  async function callListEnvironments() {
     // Construct request
     const request = {
       parent,
@@ -55,7 +55,7 @@ function main(parent) {
     }
   }
 
-  listEnvironments();
+  callListEnvironments();
   // [END dialogflow_v2_generated_Environments_ListEnvironments_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/environments.update_environment.js b/packages/google-cloud-dialogflow/samples/generated/v2/environments.update_environment.js
index ee20103dd85..1f1f74ec1e5 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/environments.update_environment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/environments.update_environment.js
@@ -22,11 +22,11 @@ function main(environment, updateMask) {
   /**
    *  Required. The environment to update.
    */
-  // const environment = ''
+  // const environment = {}
   /**
    *  Required. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
   /**
    *  Optional. This field is used to prevent accidental overwrite of the default
    *  environment, which is an operation that cannot be undone. To confirm that
@@ -41,7 +41,7 @@ function main(environment, updateMask) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function updateEnvironment() {
+  async function callUpdateEnvironment() {
     // Construct request
     const request = {
       environment,
@@ -53,7 +53,7 @@ function main(environment, updateMask) {
     console.log(response);
   }
 
-  updateEnvironment();
+  callUpdateEnvironment();
   // [END dialogflow_v2_generated_Environments_UpdateEnvironment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/fulfillments.get_fulfillment.js b/packages/google-cloud-dialogflow/samples/generated/v2/fulfillments.get_fulfillment.js
index ce7e9fb339d..a4964e957f7 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/fulfillments.get_fulfillment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/fulfillments.get_fulfillment.js
@@ -31,7 +31,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new FulfillmentsClient();
 
-  async function getFulfillment() {
+  async function callGetFulfillment() {
     // Construct request
     const request = {
       name,
@@ -42,7 +42,7 @@ function main(name) {
     console.log(response);
   }
 
-  getFulfillment();
+  callGetFulfillment();
   // [END dialogflow_v2_generated_Fulfillments_GetFulfillment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/fulfillments.update_fulfillment.js b/packages/google-cloud-dialogflow/samples/generated/v2/fulfillments.update_fulfillment.js
index 3ac1213a036..b82cbae8302 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/fulfillments.update_fulfillment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/fulfillments.update_fulfillment.js
@@ -22,12 +22,12 @@ function main(fulfillment, updateMask) {
   /**
    *  Required. The fulfillment to update.
    */
-  // const fulfillment = ''
+  // const fulfillment = {}
   /**
    *  Required. The mask to control which fields get updated. If the mask is not
    *  present, all fields will be updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {FulfillmentsClient} = require('@google-cloud/dialogflow').v2;
@@ -35,7 +35,7 @@ function main(fulfillment, updateMask) {
   // Instantiates a client
   const dialogflowClient = new FulfillmentsClient();
 
-  async function updateFulfillment() {
+  async function callUpdateFulfillment() {
     // Construct request
     const request = {
       fulfillment,
@@ -47,7 +47,7 @@ function main(fulfillment, updateMask) {
     console.log(response);
   }
 
-  updateFulfillment();
+  callUpdateFulfillment();
   // [END dialogflow_v2_generated_Fulfillments_UpdateFulfillment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/intents.batch_delete_intents.js b/packages/google-cloud-dialogflow/samples/generated/v2/intents.batch_delete_intents.js
index 8188369216c..b4d9a9708bc 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/intents.batch_delete_intents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/intents.batch_delete_intents.js
@@ -36,7 +36,7 @@ function main(parent, intents) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function batchDeleteIntents() {
+  async function callBatchDeleteIntents() {
     // Construct request
     const request = {
       parent,
@@ -49,7 +49,7 @@ function main(parent, intents) {
     console.log(response);
   }
 
-  batchDeleteIntents();
+  callBatchDeleteIntents();
   // [END dialogflow_v2_generated_Intents_BatchDeleteIntents_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/intents.batch_update_intents.js b/packages/google-cloud-dialogflow/samples/generated/v2/intents.batch_update_intents.js
index 53b5ed5d2ff..6bcf128b768 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/intents.batch_update_intents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/intents.batch_update_intents.js
@@ -33,23 +33,23 @@ function main(parent) {
   /**
    *  The collection of intents to update or create.
    */
-  // const intentBatchInline = ''
+  // const intentBatchInline = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
 
   // Imports the Dialogflow library
   const {IntentsClient} = require('@google-cloud/dialogflow').v2;
@@ -57,7 +57,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function batchUpdateIntents() {
+  async function callBatchUpdateIntents() {
     // Construct request
     const request = {
       parent,
@@ -69,7 +69,7 @@ function main(parent) {
     console.log(response);
   }
 
-  batchUpdateIntents();
+  callBatchUpdateIntents();
   // [END dialogflow_v2_generated_Intents_BatchUpdateIntents_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/intents.create_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2/intents.create_intent.js
index 17cfc2ccb72..c47372294d3 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/intents.create_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/intents.create_intent.js
@@ -27,19 +27,19 @@ function main(parent, intent) {
   /**
    *  Required. The intent to create.
    */
-  // const intent = ''
+  // const intent = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
 
   // Imports the Dialogflow library
   const {IntentsClient} = require('@google-cloud/dialogflow').v2;
@@ -47,7 +47,7 @@ function main(parent, intent) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function createIntent() {
+  async function callCreateIntent() {
     // Construct request
     const request = {
       parent,
@@ -59,7 +59,7 @@ function main(parent, intent) {
     console.log(response);
   }
 
-  createIntent();
+  callCreateIntent();
   // [END dialogflow_v2_generated_Intents_CreateIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/intents.delete_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2/intents.delete_intent.js
index dcbc428732a..5c00916866a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/intents.delete_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/intents.delete_intent.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function deleteIntent() {
+  async function callDeleteIntent() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteIntent();
+  callDeleteIntent();
   // [END dialogflow_v2_generated_Intents_DeleteIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/intents.get_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2/intents.get_intent.js
index cf3a45c43a7..92dab8aa367 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/intents.get_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/intents.get_intent.js
@@ -28,14 +28,14 @@ function main(name) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
 
   // Imports the Dialogflow library
   const {IntentsClient} = require('@google-cloud/dialogflow').v2;
@@ -43,7 +43,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function getIntent() {
+  async function callGetIntent() {
     // Construct request
     const request = {
       name,
@@ -54,7 +54,7 @@ function main(name) {
     console.log(response);
   }
 
-  getIntent();
+  callGetIntent();
   // [END dialogflow_v2_generated_Intents_GetIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/intents.list_intents.js b/packages/google-cloud-dialogflow/samples/generated/v2/intents.list_intents.js
index 9de1ab9f828..10b521d9e57 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/intents.list_intents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/intents.list_intents.js
@@ -35,14 +35,14 @@ function main(parent) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
   /**
    *  Optional. The maximum number of items to return in a single page. By
    *  default 100 and at most 1000.
@@ -59,7 +59,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function listIntents() {
+  async function callListIntents() {
     // Construct request
     const request = {
       parent,
@@ -72,7 +72,7 @@ function main(parent) {
     }
   }
 
-  listIntents();
+  callListIntents();
   // [END dialogflow_v2_generated_Intents_ListIntents_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/intents.update_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2/intents.update_intent.js
index 6ffaae383ea..47d085b0f47 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/intents.update_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/intents.update_intent.js
@@ -22,23 +22,23 @@ function main(intent) {
   /**
    *  Required. The intent to update.
    */
-  // const intent = ''
+  // const intent = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
 
   // Imports the Dialogflow library
   const {IntentsClient} = require('@google-cloud/dialogflow').v2;
@@ -46,7 +46,7 @@ function main(intent) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function updateIntent() {
+  async function callUpdateIntent() {
     // Construct request
     const request = {
       intent,
@@ -57,7 +57,7 @@ function main(intent) {
     console.log(response);
   }
 
-  updateIntent();
+  callUpdateIntent();
   // [END dialogflow_v2_generated_Intents_UpdateIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.create_knowledge_base.js b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.create_knowledge_base.js
index 008cc3d364e..a6d5e82f0f7 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.create_knowledge_base.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.create_knowledge_base.js
@@ -27,7 +27,7 @@ function main(parent, knowledgeBase) {
   /**
    *  Required. The knowledge base to create.
    */
-  // const knowledgeBase = ''
+  // const knowledgeBase = {}
 
   // Imports the Dialogflow library
   const {KnowledgeBasesClient} = require('@google-cloud/dialogflow').v2;
@@ -35,7 +35,7 @@ function main(parent, knowledgeBase) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function createKnowledgeBase() {
+  async function callCreateKnowledgeBase() {
     // Construct request
     const request = {
       parent,
@@ -47,7 +47,7 @@ function main(parent, knowledgeBase) {
     console.log(response);
   }
 
-  createKnowledgeBase();
+  callCreateKnowledgeBase();
   // [END dialogflow_v2_generated_KnowledgeBases_CreateKnowledgeBase_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.delete_knowledge_base.js b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.delete_knowledge_base.js
index 0cc40c59c8e..1a1f60ac8ef 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.delete_knowledge_base.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.delete_knowledge_base.js
@@ -37,7 +37,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function deleteKnowledgeBase() {
+  async function callDeleteKnowledgeBase() {
     // Construct request
     const request = {
       name,
@@ -48,7 +48,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteKnowledgeBase();
+  callDeleteKnowledgeBase();
   // [END dialogflow_v2_generated_KnowledgeBases_DeleteKnowledgeBase_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.get_knowledge_base.js b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.get_knowledge_base.js
index e3fafe26139..6e940e75e99 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.get_knowledge_base.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.get_knowledge_base.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function getKnowledgeBase() {
+  async function callGetKnowledgeBase() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getKnowledgeBase();
+  callGetKnowledgeBase();
   // [END dialogflow_v2_generated_KnowledgeBases_GetKnowledgeBase_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.list_knowledge_bases.js b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.list_knowledge_bases.js
index f6bbbb5bc62..0e238398355 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.list_knowledge_bases.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.list_knowledge_bases.js
@@ -40,7 +40,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function listKnowledgeBases() {
+  async function callListKnowledgeBases() {
     // Construct request
     const request = {
       parent,
@@ -53,7 +53,7 @@ function main(parent) {
     }
   }
 
-  listKnowledgeBases();
+  callListKnowledgeBases();
   // [END dialogflow_v2_generated_KnowledgeBases_ListKnowledgeBases_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.update_knowledge_base.js b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.update_knowledge_base.js
index 5929ab08cf6..57aa2bf4091 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.update_knowledge_base.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/knowledge_bases.update_knowledge_base.js
@@ -22,13 +22,13 @@ function main(knowledgeBase) {
   /**
    *  Required. The knowledge base to update.
    */
-  // const knowledgeBase = ''
+  // const knowledgeBase = {}
   /**
    *  Optional. Not specified means `update all`.
    *  Currently, only `display_name` can be updated, an InvalidArgument will be
    *  returned for attempting to update other fields.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {KnowledgeBasesClient} = require('@google-cloud/dialogflow').v2;
@@ -36,7 +36,7 @@ function main(knowledgeBase) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function updateKnowledgeBase() {
+  async function callUpdateKnowledgeBase() {
     // Construct request
     const request = {
       knowledgeBase,
@@ -47,7 +47,7 @@ function main(knowledgeBase) {
     console.log(response);
   }
 
-  updateKnowledgeBase();
+  callUpdateKnowledgeBase();
   // [END dialogflow_v2_generated_KnowledgeBases_UpdateKnowledgeBase_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/participants.analyze_content.js b/packages/google-cloud-dialogflow/samples/generated/v2/participants.analyze_content.js
index d94b4ea199e..fd76de76023 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/participants.analyze_content.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/participants.analyze_content.js
@@ -28,11 +28,11 @@ function main(participant) {
   /**
    *  The natural language text to be processed.
    */
-  // const textInput = ''
+  // const textInput = {}
   /**
    *  An input event to send to Dialogflow.
    */
-  // const eventInput = ''
+  // const eventInput = {}
   /**
    *  Speech synthesis configuration.
    *  The speech synthesis settings for a virtual agent that may be configured
@@ -40,11 +40,11 @@ function main(participant) {
    *  AnalyzeContent. If this configuration is not supplied, speech synthesis
    *  is disabled.
    */
-  // const replyAudioConfig = ''
+  // const replyAudioConfig = {}
   /**
    *  Parameters for a Dialogflow virtual-agent query.
    */
-  // const queryParams = ''
+  // const queryParams = {}
   /**
    *  A unique identifier for this request. Restricted to 36 ASCII characters.
    *  A random UUID is recommended.
@@ -58,7 +58,7 @@ function main(participant) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function analyzeContent() {
+  async function callAnalyzeContent() {
     // Construct request
     const request = {
       participant,
@@ -69,7 +69,7 @@ function main(participant) {
     console.log(response);
   }
 
-  analyzeContent();
+  callAnalyzeContent();
   // [END dialogflow_v2_generated_Participants_AnalyzeContent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/participants.create_participant.js b/packages/google-cloud-dialogflow/samples/generated/v2/participants.create_participant.js
index 46d152a9cec..5b1cd5033b2 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/participants.create_participant.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/participants.create_participant.js
@@ -28,7 +28,7 @@ function main(parent, participant) {
   /**
    *  Required. The participant to create.
    */
-  // const participant = ''
+  // const participant = {}
 
   // Imports the Dialogflow library
   const {ParticipantsClient} = require('@google-cloud/dialogflow').v2;
@@ -36,7 +36,7 @@ function main(parent, participant) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function createParticipant() {
+  async function callCreateParticipant() {
     // Construct request
     const request = {
       parent,
@@ -48,7 +48,7 @@ function main(parent, participant) {
     console.log(response);
   }
 
-  createParticipant();
+  callCreateParticipant();
   // [END dialogflow_v2_generated_Participants_CreateParticipant_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/participants.get_participant.js b/packages/google-cloud-dialogflow/samples/generated/v2/participants.get_participant.js
index 9a868a188f5..f5b8e5620bc 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/participants.get_participant.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/participants.get_participant.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function getParticipant() {
+  async function callGetParticipant() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getParticipant();
+  callGetParticipant();
   // [END dialogflow_v2_generated_Participants_GetParticipant_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/participants.list_participants.js b/packages/google-cloud-dialogflow/samples/generated/v2/participants.list_participants.js
index 9763ed22084..73396c16c45 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/participants.list_participants.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/participants.list_participants.js
@@ -41,7 +41,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function listParticipants() {
+  async function callListParticipants() {
     // Construct request
     const request = {
       parent,
@@ -54,7 +54,7 @@ function main(parent) {
     }
   }
 
-  listParticipants();
+  callListParticipants();
   // [END dialogflow_v2_generated_Participants_ListParticipants_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/participants.suggest_articles.js b/packages/google-cloud-dialogflow/samples/generated/v2/participants.suggest_articles.js
index ce418812155..c1edb421bae 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/participants.suggest_articles.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/participants.suggest_articles.js
@@ -34,7 +34,7 @@ function main(parent) {
   // const latestMessage = 'abc123'
   /**
    *  Max number of messages prior to and including
-   *  [latest_message][google.cloud.dialogflow.v2.SuggestArticlesRequest.latest_message] to use as context
+   *  latest_message google.cloud.dialogflow.v2.SuggestArticlesRequest.latest_message  to use as context
    *  when compiling the suggestion. By default 20 and at most 50.
    */
   // const contextSize = 1234
@@ -45,7 +45,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function suggestArticles() {
+  async function callSuggestArticles() {
     // Construct request
     const request = {
       parent,
@@ -56,7 +56,7 @@ function main(parent) {
     console.log(response);
   }
 
-  suggestArticles();
+  callSuggestArticles();
   // [END dialogflow_v2_generated_Participants_SuggestArticles_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/participants.suggest_faq_answers.js b/packages/google-cloud-dialogflow/samples/generated/v2/participants.suggest_faq_answers.js
index 4620edf33c3..3f76b91d86b 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/participants.suggest_faq_answers.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/participants.suggest_faq_answers.js
@@ -34,7 +34,7 @@ function main(parent) {
   // const latestMessage = 'abc123'
   /**
    *  Max number of messages prior to and including
-   *  [latest_message] to use as context when compiling the
+   *  latest_message  to use as context when compiling the
    *  suggestion. By default 20 and at most 50.
    */
   // const contextSize = 1234
@@ -45,7 +45,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function suggestFaqAnswers() {
+  async function callSuggestFaqAnswers() {
     // Construct request
     const request = {
       parent,
@@ -56,7 +56,7 @@ function main(parent) {
     console.log(response);
   }
 
-  suggestFaqAnswers();
+  callSuggestFaqAnswers();
   // [END dialogflow_v2_generated_Participants_SuggestFaqAnswers_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/participants.update_participant.js b/packages/google-cloud-dialogflow/samples/generated/v2/participants.update_participant.js
index 4a356e691af..f588dc380d2 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/participants.update_participant.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/participants.update_participant.js
@@ -22,11 +22,11 @@ function main(participant, updateMask) {
   /**
    *  Required. The participant to update.
    */
-  // const participant = ''
+  // const participant = {}
   /**
    *  Required. The mask to specify which fields to update.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {ParticipantsClient} = require('@google-cloud/dialogflow').v2;
@@ -34,7 +34,7 @@ function main(participant, updateMask) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function updateParticipant() {
+  async function callUpdateParticipant() {
     // Construct request
     const request = {
       participant,
@@ -46,7 +46,7 @@ function main(participant, updateMask) {
     console.log(response);
   }
 
-  updateParticipant();
+  callUpdateParticipant();
   // [END dialogflow_v2_generated_Participants_UpdateParticipant_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.create_session_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.create_session_entity_type.js
index 075c79407be..d68283bef75 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.create_session_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.create_session_entity_type.js
@@ -31,7 +31,7 @@ function main(parent, sessionEntityType) {
   /**
    *  Required. The session entity type to create.
    */
-  // const sessionEntityType = ''
+  // const sessionEntityType = {}
 
   // Imports the Dialogflow library
   const {SessionEntityTypesClient} = require('@google-cloud/dialogflow').v2;
@@ -39,7 +39,7 @@ function main(parent, sessionEntityType) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function createSessionEntityType() {
+  async function callCreateSessionEntityType() {
     // Construct request
     const request = {
       parent,
@@ -51,7 +51,7 @@ function main(parent, sessionEntityType) {
     console.log(response);
   }
 
-  createSessionEntityType();
+  callCreateSessionEntityType();
   // [END dialogflow_v2_generated_SessionEntityTypes_CreateSessionEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.delete_session_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.delete_session_entity_type.js
index 8a8c5821e14..5d6da599cf9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.delete_session_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.delete_session_entity_type.js
@@ -36,7 +36,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function deleteSessionEntityType() {
+  async function callDeleteSessionEntityType() {
     // Construct request
     const request = {
       name,
@@ -47,7 +47,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteSessionEntityType();
+  callDeleteSessionEntityType();
   // [END dialogflow_v2_generated_SessionEntityTypes_DeleteSessionEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.get_session_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.get_session_entity_type.js
index 5d97d84533d..438c090eb47 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.get_session_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.get_session_entity_type.js
@@ -36,7 +36,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function getSessionEntityType() {
+  async function callGetSessionEntityType() {
     // Construct request
     const request = {
       name,
@@ -47,7 +47,7 @@ function main(name) {
     console.log(response);
   }
 
-  getSessionEntityType();
+  callGetSessionEntityType();
   // [END dialogflow_v2_generated_SessionEntityTypes_GetSessionEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.list_session_entity_types.js b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.list_session_entity_types.js
index d84930ae2c7..9cd4b18a07b 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.list_session_entity_types.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.list_session_entity_types.js
@@ -44,7 +44,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function listSessionEntityTypes() {
+  async function callListSessionEntityTypes() {
     // Construct request
     const request = {
       parent,
@@ -59,7 +59,7 @@ function main(parent) {
     }
   }
 
-  listSessionEntityTypes();
+  callListSessionEntityTypes();
   // [END dialogflow_v2_generated_SessionEntityTypes_ListSessionEntityTypes_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.update_session_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.update_session_entity_type.js
index 9b116d4c838..5164b4b4e6b 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.update_session_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/session_entity_types.update_session_entity_type.js
@@ -22,11 +22,11 @@ function main(sessionEntityType) {
   /**
    *  Required. The session entity type to update.
    */
-  // const sessionEntityType = ''
+  // const sessionEntityType = {}
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {SessionEntityTypesClient} = require('@google-cloud/dialogflow').v2;
@@ -34,7 +34,7 @@ function main(sessionEntityType) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function updateSessionEntityType() {
+  async function callUpdateSessionEntityType() {
     // Construct request
     const request = {
       sessionEntityType,
@@ -45,7 +45,7 @@ function main(sessionEntityType) {
     console.log(response);
   }
 
-  updateSessionEntityType();
+  callUpdateSessionEntityType();
   // [END dialogflow_v2_generated_SessionEntityTypes_UpdateSessionEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/sessions.detect_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2/sessions.detect_intent.js
index a22ccae83b7..aad680eb739 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/sessions.detect_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/sessions.detect_intent.js
@@ -30,17 +30,17 @@ function main(session, queryInput) {
    *  and `User Id`. They can be a random number or some type of user and session
    *  identifiers (preferably hashed). The length of the `Session ID` and
    *  `User ID` must not exceed 36 characters.
-   *  For more information, see the [API interactions
-   *  guide](https://cloud.google.com/dialogflow/docs/api-overview).
+   *  For more information, see the API interactions
+   *  guide (https://cloud.google.com/dialogflow/docs/api-overview).
    *  Note: Always use agent versions for production traffic.
-   *  See [Versions and
-   *  environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
+   *  See Versions and
+   *  environments (https://cloud.google.com/dialogflow/es/docs/agents-versions).
    */
   // const session = 'abc123'
   /**
    *  The parameters of this query.
    */
-  // const queryParams = ''
+  // const queryParams = {}
   /**
    *  Required. The input specification. It can be set to:
    *  1.  an audio config
@@ -48,21 +48,21 @@ function main(session, queryInput) {
    *  2.  a conversational query in the form of text, or
    *  3.  an event that specifies which intent to trigger.
    */
-  // const queryInput = ''
+  // const queryInput = {}
   /**
    *  Instructs the speech synthesizer how to generate the output
    *  audio. If this field is not set and agent-level speech synthesizer is not
    *  configured, no output audio is generated.
    */
-  // const outputAudioConfig = ''
+  // const outputAudioConfig = {}
   /**
-   *  Mask for [output_audio_config][google.cloud.dialogflow.v2.DetectIntentRequest.output_audio_config] indicating which settings in this
+   *  Mask for output_audio_config google.cloud.dialogflow.v2.DetectIntentRequest.output_audio_config  indicating which settings in this
    *  request-level config should override speech synthesizer settings defined at
    *  agent-level.
-   *  If unspecified or empty, [output_audio_config][google.cloud.dialogflow.v2.DetectIntentRequest.output_audio_config] replaces the agent-level
+   *  If unspecified or empty, output_audio_config google.cloud.dialogflow.v2.DetectIntentRequest.output_audio_config  replaces the agent-level
    *  config in its entirety.
    */
-  // const outputAudioConfigMask = ''
+  // const outputAudioConfigMask = {}
   /**
    *  The natural language speech audio to be processed. This field
    *  should be populated iff `query_input` is set to an input audio config.
@@ -76,7 +76,7 @@ function main(session, queryInput) {
   // Instantiates a client
   const dialogflowClient = new SessionsClient();
 
-  async function detectIntent() {
+  async function callDetectIntent() {
     // Construct request
     const request = {
       session,
@@ -88,7 +88,7 @@ function main(session, queryInput) {
     console.log(response);
   }
 
-  detectIntent();
+  callDetectIntent();
   // [END dialogflow_v2_generated_Sessions_DetectIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/sessions.streaming_detect_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2/sessions.streaming_detect_intent.js
index 8933abec7fd..81d02e2b9c9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/sessions.streaming_detect_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/sessions.streaming_detect_intent.js
@@ -30,17 +30,17 @@ function main(session, queryInput) {
    *  `User Id`. They can be a random number or some type of user and session
    *  identifiers (preferably hashed). The length of the `Session ID` and
    *  `User ID` must not exceed 36 characters.
-   *  For more information, see the [API interactions
-   *  guide](https://cloud.google.com/dialogflow/docs/api-overview).
+   *  For more information, see the API interactions
+   *  guide (https://cloud.google.com/dialogflow/docs/api-overview).
    *  Note: Always use agent versions for production traffic.
-   *  See [Versions and
-   *  environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
+   *  See Versions and
+   *  environments (https://cloud.google.com/dialogflow/es/docs/agents-versions).
    */
   // const session = 'abc123'
   /**
    *  The parameters of this query.
    */
-  // const queryParams = ''
+  // const queryParams = {}
   /**
    *  Required. The input specification. It can be set to:
    *  1.  an audio config which instructs the speech recognizer how to process
@@ -48,9 +48,9 @@ function main(session, queryInput) {
    *  2.  a conversational query in the form of text, or
    *  3.  an event that specifies which intent to trigger.
    */
-  // const queryInput = ''
+  // const queryInput = {}
   /**
-   *  Please use [InputAudioConfig.single_utterance][google.cloud.dialogflow.v2.InputAudioConfig.single_utterance] instead.
+   *  Please use InputAudioConfig.single_utterance google.cloud.dialogflow.v2.InputAudioConfig.single_utterance  instead.
    *  If `false` (default), recognition does not cease until
    *  the client closes the stream. If `true`, the recognizer will detect a
    *  single spoken utterance in input audio. Recognition ceases when it detects
@@ -65,15 +65,15 @@ function main(session, queryInput) {
    *  audio. If this field is not set and agent-level speech synthesizer is not
    *  configured, no output audio is generated.
    */
-  // const outputAudioConfig = ''
+  // const outputAudioConfig = {}
   /**
-   *  Mask for [output_audio_config][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config] indicating which settings in this
+   *  Mask for output_audio_config google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config  indicating which settings in this
    *  request-level config should override speech synthesizer settings defined at
    *  agent-level.
-   *  If unspecified or empty, [output_audio_config][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config] replaces the agent-level
+   *  If unspecified or empty, output_audio_config google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config  replaces the agent-level
    *  config in its entirety.
    */
-  // const outputAudioConfigMask = ''
+  // const outputAudioConfigMask = {}
   /**
    *  The input audio content to be recognized. Must be sent if
    *  `query_input` was set to a streaming input audio config. The complete audio
@@ -87,7 +87,7 @@ function main(session, queryInput) {
   // Instantiates a client
   const dialogflowClient = new SessionsClient();
 
-  async function streamingDetectIntent() {
+  async function callStreamingDetectIntent() {
     // Construct request
     const request = {
       session,
@@ -109,7 +109,7 @@ function main(session, queryInput) {
     stream.end();
   }
 
-  streamingDetectIntent();
+  callStreamingDetectIntent();
   // [END dialogflow_v2_generated_Sessions_StreamingDetectIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/versions.create_version.js b/packages/google-cloud-dialogflow/samples/generated/v2/versions.create_version.js
index be92d55aa4c..431dc512479 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/versions.create_version.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/versions.create_version.js
@@ -29,7 +29,7 @@ function main(parent, version) {
   /**
    *  Required. The version to create.
    */
-  // const version = ''
+  // const version = {}
 
   // Imports the Dialogflow library
   const {VersionsClient} = require('@google-cloud/dialogflow').v2;
@@ -37,7 +37,7 @@ function main(parent, version) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function createVersion() {
+  async function callCreateVersion() {
     // Construct request
     const request = {
       parent,
@@ -49,7 +49,7 @@ function main(parent, version) {
     console.log(response);
   }
 
-  createVersion();
+  callCreateVersion();
   // [END dialogflow_v2_generated_Versions_CreateVersion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/versions.delete_version.js b/packages/google-cloud-dialogflow/samples/generated/v2/versions.delete_version.js
index 1d6f0c6a080..c50eba6d840 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/versions.delete_version.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/versions.delete_version.js
@@ -34,7 +34,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function deleteVersion() {
+  async function callDeleteVersion() {
     // Construct request
     const request = {
       name,
@@ -45,7 +45,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteVersion();
+  callDeleteVersion();
   // [END dialogflow_v2_generated_Versions_DeleteVersion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/versions.get_version.js b/packages/google-cloud-dialogflow/samples/generated/v2/versions.get_version.js
index fb294cd6f67..2e2abef66cb 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/versions.get_version.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/versions.get_version.js
@@ -34,7 +34,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function getVersion() {
+  async function callGetVersion() {
     // Construct request
     const request = {
       name,
@@ -45,7 +45,7 @@ function main(name) {
     console.log(response);
   }
 
-  getVersion();
+  callGetVersion();
   // [END dialogflow_v2_generated_Versions_GetVersion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/versions.list_versions.js b/packages/google-cloud-dialogflow/samples/generated/v2/versions.list_versions.js
index f459917dda9..a4d30d94d69 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/versions.list_versions.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/versions.list_versions.js
@@ -42,7 +42,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function listVersions() {
+  async function callListVersions() {
     // Construct request
     const request = {
       parent,
@@ -55,7 +55,7 @@ function main(parent) {
     }
   }
 
-  listVersions();
+  callListVersions();
   // [END dialogflow_v2_generated_Versions_ListVersions_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2/versions.update_version.js b/packages/google-cloud-dialogflow/samples/generated/v2/versions.update_version.js
index 18d11ac89e1..be19687da8e 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2/versions.update_version.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2/versions.update_version.js
@@ -26,11 +26,11 @@ function main(version, updateMask) {
    *  - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
    *    ID>`
    */
-  // const version = ''
+  // const version = {}
   /**
    *  Required. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {VersionsClient} = require('@google-cloud/dialogflow').v2;
@@ -38,7 +38,7 @@ function main(version, updateMask) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function updateVersion() {
+  async function callUpdateVersion() {
     // Construct request
     const request = {
       version,
@@ -50,7 +50,7 @@ function main(version, updateMask) {
     console.log(response);
   }
 
-  updateVersion();
+  callUpdateVersion();
   // [END dialogflow_v2_generated_Versions_UpdateVersion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.delete_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.delete_agent.js
index 99bf4a318fe..ec55a01922c 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.delete_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.delete_agent.js
@@ -32,7 +32,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function deleteAgent() {
+  async function callDeleteAgent() {
     // Construct request
     const request = {
       parent,
@@ -43,7 +43,7 @@ function main(parent) {
     console.log(response);
   }
 
-  deleteAgent();
+  callDeleteAgent();
   // [END dialogflow_v2beta1_generated_Agents_DeleteAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.export_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.export_agent.js
index a8d65906353..50a2b3318ef 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.export_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.export_agent.js
@@ -27,7 +27,7 @@ function main(parent) {
   // const parent = 'abc123'
   /**
    *  Optional. The
-   *  [Google Cloud Storage](https://cloud.google.com/storage/docs/)
+   *  Google Cloud Storage (https://cloud.google.com/storage/docs/)
    *  URI to export the agent to.
    *  The format of this URI must be `gs://<bucket-name>/<object-name>`.
    *  If left unspecified, the serialized agent is returned inline.
@@ -40,7 +40,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function exportAgent() {
+  async function callExportAgent() {
     // Construct request
     const request = {
       parent,
@@ -52,7 +52,7 @@ function main(parent) {
     console.log(response);
   }
 
-  exportAgent();
+  callExportAgent();
   // [END dialogflow_v2beta1_generated_Agents_ExportAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.get_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.get_agent.js
index 5b9d737bbdd..f1df4b9d9d4 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.get_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.get_agent.js
@@ -32,7 +32,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function getAgent() {
+  async function callGetAgent() {
     // Construct request
     const request = {
       parent,
@@ -43,7 +43,7 @@ function main(parent) {
     console.log(response);
   }
 
-  getAgent();
+  callGetAgent();
   // [END dialogflow_v2beta1_generated_Agents_GetAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.get_validation_result.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.get_validation_result.js
index d63e308d9d6..a0c75ce06eb 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.get_validation_result.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.get_validation_result.js
@@ -27,8 +27,8 @@ function main(parent) {
   // const parent = 'abc123'
   /**
    *  Optional. The language for which you want a validation result. If not
-   *  specified, the agent's default language is used. [Many
-   *  languages](https://cloud.google.com/dialogflow/docs/reference/language)
+   *  specified, the agent's default language is used. Many
+   *  languages (https://cloud.google.com/dialogflow/docs/reference/language)
    *  are supported. Note: languages must be enabled in the agent before they can
    *  be used.
    */
@@ -40,7 +40,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function getValidationResult() {
+  async function callGetValidationResult() {
     // Construct request
     const request = {
       parent,
@@ -51,7 +51,7 @@ function main(parent) {
     console.log(response);
   }
 
-  getValidationResult();
+  callGetValidationResult();
   // [END dialogflow_v2beta1_generated_Agents_GetValidationResult_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.import_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.import_agent.js
index e103013e97b..f1645093471 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.import_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.import_agent.js
@@ -41,7 +41,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function importAgent() {
+  async function callImportAgent() {
     // Construct request
     const request = {
       parent,
@@ -53,7 +53,7 @@ function main(parent) {
     console.log(response);
   }
 
-  importAgent();
+  callImportAgent();
   // [END dialogflow_v2beta1_generated_Agents_ImportAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.restore_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.restore_agent.js
index 2aece129733..48cfcf99bc1 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.restore_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.restore_agent.js
@@ -41,7 +41,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function restoreAgent() {
+  async function callRestoreAgent() {
     // Construct request
     const request = {
       parent,
@@ -53,7 +53,7 @@ function main(parent) {
     console.log(response);
   }
 
-  restoreAgent();
+  callRestoreAgent();
   // [END dialogflow_v2beta1_generated_Agents_RestoreAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.search_agents.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.search_agents.js
index 2aaa602a96c..afbcf10c924 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.search_agents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.search_agents.js
@@ -41,7 +41,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function searchAgents() {
+  async function callSearchAgents() {
     // Construct request
     const request = {
       parent,
@@ -54,7 +54,7 @@ function main(parent) {
     }
   }
 
-  searchAgents();
+  callSearchAgents();
   // [END dialogflow_v2beta1_generated_Agents_SearchAgents_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.set_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.set_agent.js
index 0d652315e52..a0e19d34798 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.set_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.set_agent.js
@@ -22,11 +22,11 @@ function main(agent) {
   /**
    *  Required. The agent to update.
    */
-  // const agent = ''
+  // const agent = {}
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {AgentsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -34,7 +34,7 @@ function main(agent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function setAgent() {
+  async function callSetAgent() {
     // Construct request
     const request = {
       agent,
@@ -45,7 +45,7 @@ function main(agent) {
     console.log(response);
   }
 
-  setAgent();
+  callSetAgent();
   // [END dialogflow_v2beta1_generated_Agents_SetAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.train_agent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.train_agent.js
index cb3cbb7d054..45b2026716d 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.train_agent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/agents.train_agent.js
@@ -32,7 +32,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new AgentsClient();
 
-  async function trainAgent() {
+  async function callTrainAgent() {
     // Construct request
     const request = {
       parent,
@@ -44,7 +44,7 @@ function main(parent) {
     console.log(response);
   }
 
-  trainAgent();
+  callTrainAgent();
   // [END dialogflow_v2beta1_generated_Agents_TrainAgent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.get_answer_record.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.get_answer_record.js
index bf4f628a8bc..4f33de4b16e 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.get_answer_record.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.get_answer_record.js
@@ -32,7 +32,7 @@ function main() {
   // Instantiates a client
   const dialogflowClient = new AnswerRecordsClient();
 
-  async function getAnswerRecord() {
+  async function callGetAnswerRecord() {
     // Construct request
     const request = {};
 
@@ -41,7 +41,7 @@ function main() {
     console.log(response);
   }
 
-  getAnswerRecord();
+  callGetAnswerRecord();
   // [END dialogflow_v2beta1_generated_AnswerRecords_GetAnswerRecord_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.list_answer_records.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.list_answer_records.js
index 1e23d6feb90..626c1ca4676 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.list_answer_records.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.list_answer_records.js
@@ -33,7 +33,7 @@ function main() {
   // const pageSize = 1234
   /**
    *  Optional. The
-   *  [ListAnswerRecordsResponse.next_page_token][google.cloud.dialogflow.v2beta1.ListAnswerRecordsResponse.next_page_token]
+   *  ListAnswerRecordsResponse.next_page_token google.cloud.dialogflow.v2beta1.ListAnswerRecordsResponse.next_page_token
    *  value returned from a previous list request used to continue listing on
    *  the next page.
    */
@@ -45,7 +45,7 @@ function main() {
   // Instantiates a client
   const dialogflowClient = new AnswerRecordsClient();
 
-  async function listAnswerRecords() {
+  async function callListAnswerRecords() {
     // Construct request
     const request = {};
 
@@ -56,7 +56,7 @@ function main() {
     }
   }
 
-  listAnswerRecords();
+  callListAnswerRecords();
   // [END dialogflow_v2beta1_generated_AnswerRecords_ListAnswerRecords_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.update_answer_record.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.update_answer_record.js
index 1bc87c0fe2f..914a599ad3e 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.update_answer_record.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/answer_records.update_answer_record.js
@@ -22,11 +22,11 @@ function main(answerRecord) {
   /**
    *  Required. Answer record to update.
    */
-  // const answerRecord = ''
+  // const answerRecord = {}
   /**
    *  Required. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {AnswerRecordsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -34,7 +34,7 @@ function main(answerRecord) {
   // Instantiates a client
   const dialogflowClient = new AnswerRecordsClient();
 
-  async function updateAnswerRecord() {
+  async function callUpdateAnswerRecord() {
     // Construct request
     const request = {
       answerRecord,
@@ -45,7 +45,7 @@ function main(answerRecord) {
     console.log(response);
   }
 
-  updateAnswerRecord();
+  callUpdateAnswerRecord();
   // [END dialogflow_v2beta1_generated_AnswerRecords_UpdateAnswerRecord_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.create_context.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.create_context.js
index ba295b92351..042977db8b6 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.create_context.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.create_context.js
@@ -37,7 +37,7 @@ function main(parent, context) {
   /**
    *  Required. The context to create.
    */
-  // const context = ''
+  // const context = {}
 
   // Imports the Dialogflow library
   const {ContextsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -45,7 +45,7 @@ function main(parent, context) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function createContext() {
+  async function callCreateContext() {
     // Construct request
     const request = {
       parent,
@@ -57,7 +57,7 @@ function main(parent, context) {
     console.log(response);
   }
 
-  createContext();
+  callCreateContext();
   // [END dialogflow_v2beta1_generated_Contexts_CreateContext_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.delete_all_contexts.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.delete_all_contexts.js
index 4101c1daddf..18916f3b095 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.delete_all_contexts.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.delete_all_contexts.js
@@ -41,7 +41,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function deleteAllContexts() {
+  async function callDeleteAllContexts() {
     // Construct request
     const request = {
       parent,
@@ -52,7 +52,7 @@ function main(parent) {
     console.log(response);
   }
 
-  deleteAllContexts();
+  callDeleteAllContexts();
   // [END dialogflow_v2beta1_generated_Contexts_DeleteAllContexts_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.delete_context.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.delete_context.js
index 064baa0a7c7..eb72b3129ff 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.delete_context.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.delete_context.js
@@ -42,7 +42,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function deleteContext() {
+  async function callDeleteContext() {
     // Construct request
     const request = {
       name,
@@ -53,7 +53,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteContext();
+  callDeleteContext();
   // [END dialogflow_v2beta1_generated_Contexts_DeleteContext_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.get_context.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.get_context.js
index 8a9f74655ce..5d47cec4a3b 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.get_context.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.get_context.js
@@ -42,7 +42,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function getContext() {
+  async function callGetContext() {
     // Construct request
     const request = {
       name,
@@ -53,7 +53,7 @@ function main(name) {
     console.log(response);
   }
 
-  getContext();
+  callGetContext();
   // [END dialogflow_v2beta1_generated_Contexts_GetContext_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.list_contexts.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.list_contexts.js
index f81fc04504b..ad1472ae891 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.list_contexts.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.list_contexts.js
@@ -50,7 +50,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function listContexts() {
+  async function callListContexts() {
     // Construct request
     const request = {
       parent,
@@ -63,7 +63,7 @@ function main(parent) {
     }
   }
 
-  listContexts();
+  callListContexts();
   // [END dialogflow_v2beta1_generated_Contexts_ListContexts_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.update_context.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.update_context.js
index ab272d0c397..627099f1d7d 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.update_context.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/contexts.update_context.js
@@ -22,11 +22,11 @@ function main(context) {
   /**
    *  Required. The context to update.
    */
-  // const context = ''
+  // const context = {}
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {ContextsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -34,7 +34,7 @@ function main(context) {
   // Instantiates a client
   const dialogflowClient = new ContextsClient();
 
-  async function updateContext() {
+  async function callUpdateContext() {
     // Construct request
     const request = {
       context,
@@ -45,7 +45,7 @@ function main(context) {
     console.log(response);
   }
 
-  updateContext();
+  callUpdateContext();
   // [END dialogflow_v2beta1_generated_Contexts_UpdateContext_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.create_conversation_profile.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.create_conversation_profile.js
index 3fba222bfc1..79a4cca07ac 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.create_conversation_profile.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.create_conversation_profile.js
@@ -27,7 +27,7 @@ function main(parent, conversationProfile) {
   /**
    *  Required. The conversation profile to create.
    */
-  // const conversationProfile = ''
+  // const conversationProfile = {}
 
   // Imports the Dialogflow library
   const {ConversationProfilesClient} =
@@ -36,7 +36,7 @@ function main(parent, conversationProfile) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function createConversationProfile() {
+  async function callCreateConversationProfile() {
     // Construct request
     const request = {
       parent,
@@ -48,7 +48,7 @@ function main(parent, conversationProfile) {
     console.log(response);
   }
 
-  createConversationProfile();
+  callCreateConversationProfile();
   // [END dialogflow_v2beta1_generated_ConversationProfiles_CreateConversationProfile_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.delete_conversation_profile.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.delete_conversation_profile.js
index bead81700b6..43b6079ce83 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.delete_conversation_profile.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.delete_conversation_profile.js
@@ -33,7 +33,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function deleteConversationProfile() {
+  async function callDeleteConversationProfile() {
     // Construct request
     const request = {
       name,
@@ -44,7 +44,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteConversationProfile();
+  callDeleteConversationProfile();
   // [END dialogflow_v2beta1_generated_ConversationProfiles_DeleteConversationProfile_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.get_conversation_profile.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.get_conversation_profile.js
index 50ba5ecdec6..efb5e4303ec 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.get_conversation_profile.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.get_conversation_profile.js
@@ -33,7 +33,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function getConversationProfile() {
+  async function callGetConversationProfile() {
     // Construct request
     const request = {
       name,
@@ -44,7 +44,7 @@ function main(name) {
     console.log(response);
   }
 
-  getConversationProfile();
+  callGetConversationProfile();
   // [END dialogflow_v2beta1_generated_ConversationProfiles_GetConversationProfile_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.list_conversation_profiles.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.list_conversation_profiles.js
index 5cf26e1ee9d..fe8830a8a4d 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.list_conversation_profiles.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.list_conversation_profiles.js
@@ -41,7 +41,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function listConversationProfiles() {
+  async function callListConversationProfiles() {
     // Construct request
     const request = {
       parent,
@@ -56,7 +56,7 @@ function main(parent) {
     }
   }
 
-  listConversationProfiles();
+  callListConversationProfiles();
   // [END dialogflow_v2beta1_generated_ConversationProfiles_ListConversationProfiles_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.update_conversation_profile.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.update_conversation_profile.js
index 00de3dc5223..f826203d07d 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.update_conversation_profile.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversation_profiles.update_conversation_profile.js
@@ -22,11 +22,11 @@ function main(conversationProfile, updateMask) {
   /**
    *  Required. The conversation profile to update.
    */
-  // const conversationProfile = ''
+  // const conversationProfile = {}
   /**
    *  Required. The mask to control which fields to update.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {ConversationProfilesClient} =
@@ -35,7 +35,7 @@ function main(conversationProfile, updateMask) {
   // Instantiates a client
   const dialogflowClient = new ConversationProfilesClient();
 
-  async function updateConversationProfile() {
+  async function callUpdateConversationProfile() {
     // Construct request
     const request = {
       conversationProfile,
@@ -47,7 +47,7 @@ function main(conversationProfile, updateMask) {
     console.log(response);
   }
 
-  updateConversationProfile();
+  callUpdateConversationProfile();
   // [END dialogflow_v2beta1_generated_ConversationProfiles_UpdateConversationProfile_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.batch_create_messages.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.batch_create_messages.js
index a70bb19b0e7..9d15aba9036 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.batch_create_messages.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.batch_create_messages.js
@@ -27,8 +27,8 @@ function main(parent, requests) {
   // const parent = 'abc123'
   /**
    *  Required. A maximum of 1000 Messages can be created in a batch.
-   *  [CreateMessageRequest.message.send_time][] is required. All created
-   *  messages will have identical [Message.create_time][google.cloud.dialogflow.v2beta1.Message.create_time].
+   *  CreateMessageRequest.message.send_time   is required. All created
+   *  messages will have identical Message.create_time google.cloud.dialogflow.v2beta1.Message.create_time.
    */
   // const requests = 1234
 
@@ -38,7 +38,7 @@ function main(parent, requests) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function batchCreateMessages() {
+  async function callBatchCreateMessages() {
     // Construct request
     const request = {
       parent,
@@ -50,7 +50,7 @@ function main(parent, requests) {
     console.log(response);
   }
 
-  batchCreateMessages();
+  callBatchCreateMessages();
   // [END dialogflow_v2beta1_generated_Conversations_BatchCreateMessages_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.complete_conversation.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.complete_conversation.js
index ae04e94d30c..45b088da41f 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.complete_conversation.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.complete_conversation.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function completeConversation() {
+  async function callCompleteConversation() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  completeConversation();
+  callCompleteConversation();
   // [END dialogflow_v2beta1_generated_Conversations_CompleteConversation_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.create_conversation.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.create_conversation.js
index 9c8a81b74f3..e78dbb31db4 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.create_conversation.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.create_conversation.js
@@ -27,13 +27,13 @@ function main(parent, conversation) {
   /**
    *  Required. The conversation to create.
    */
-  // const conversation = ''
+  // const conversation = {}
   /**
    *  Optional. Identifier of the conversation. Generally it's auto generated by Google.
    *  Only set it if you cannot wait for the response to return a
    *  auto-generated one to you.
    *  The conversation ID must be compliant with the regression fomula
-   *  "[a-zA-Z][a-zA-Z0-9_-]*" with the characters length in range of [3,64].
+   *  "a-zA-Z a-zA-Z0-9_-*" with the characters length in range of 3,64.
    *  If the field is provided, the caller is resposible for
    *  1. the uniqueness of the ID, otherwise the request will be rejected.
    *  2. the consistency for whether to use custom ID or not under a project to
@@ -47,7 +47,7 @@ function main(parent, conversation) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function createConversation() {
+  async function callCreateConversation() {
     // Construct request
     const request = {
       parent,
@@ -59,7 +59,7 @@ function main(parent, conversation) {
     console.log(response);
   }
 
-  createConversation();
+  callCreateConversation();
   // [END dialogflow_v2beta1_generated_Conversations_CreateConversation_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.get_conversation.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.get_conversation.js
index 27e47679e42..8dc25279829 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.get_conversation.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.get_conversation.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function getConversation() {
+  async function callGetConversation() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getConversation();
+  callGetConversation();
   // [END dialogflow_v2beta1_generated_Conversations_GetConversation_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.list_conversations.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.list_conversations.js
index 0aac35e13b8..9a2d463cca4 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.list_conversations.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.list_conversations.js
@@ -48,7 +48,7 @@ function main(parent) {
    *  the following expression only returns `COMPLETED` conversations:
    *  `lifecycle_state = "COMPLETED"`
    *  For more information about filtering, see
-   *  [API Filtering](https://aip.dev/160).
+   *  API Filtering (https://aip.dev/160).
    */
   // const filter = 'abc123'
 
@@ -58,7 +58,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function listConversations() {
+  async function callListConversations() {
     // Construct request
     const request = {
       parent,
@@ -71,7 +71,7 @@ function main(parent) {
     }
   }
 
-  listConversations();
+  callListConversations();
   // [END dialogflow_v2beta1_generated_Conversations_ListConversations_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.list_messages.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.list_messages.js
index 707ca4666e4..ce2a4ff9ea4 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.list_messages.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/conversations.list_messages.js
@@ -32,7 +32,7 @@ function main(parent) {
    *  `create_time_epoch_microseconds > 1551790877964485` or
    *  `create_time > "2017-01-15T01:30:15.01Z"`.
    *  For more information about filtering, see
-   *  [API Filtering](https://aip.dev/160).
+   *  API Filtering (https://aip.dev/160).
    */
   // const filter = 'abc123'
   /**
@@ -51,7 +51,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ConversationsClient();
 
-  async function listMessages() {
+  async function callListMessages() {
     // Construct request
     const request = {
       parent,
@@ -64,7 +64,7 @@ function main(parent) {
     }
   }
 
-  listMessages();
+  callListMessages();
   // [END dialogflow_v2beta1_generated_Conversations_ListMessages_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.create_document.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.create_document.js
index 8b50192c9ce..1b2e93eae60 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.create_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.create_document.js
@@ -28,7 +28,7 @@ function main(parent, document) {
   /**
    *  Required. The document to create.
    */
-  // const document = ''
+  // const document = {}
   /**
    *  Whether to import custom metadata from Google Cloud Storage.
    *  Only valid when the document source is Google Cloud Storage URI.
@@ -41,7 +41,7 @@ function main(parent, document) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function createDocument() {
+  async function callCreateDocument() {
     // Construct request
     const request = {
       parent,
@@ -54,7 +54,7 @@ function main(parent, document) {
     console.log(response);
   }
 
-  createDocument();
+  callCreateDocument();
   // [END dialogflow_v2beta1_generated_Documents_CreateDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.delete_document.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.delete_document.js
index 64abf22f899..37ec181cd70 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.delete_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.delete_document.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function deleteDocument() {
+  async function callDeleteDocument() {
     // Construct request
     const request = {
       name,
@@ -44,7 +44,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteDocument();
+  callDeleteDocument();
   // [END dialogflow_v2beta1_generated_Documents_DeleteDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.get_document.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.get_document.js
index 9fe147690d1..345f742862c 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.get_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.get_document.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function getDocument() {
+  async function callGetDocument() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getDocument();
+  callGetDocument();
   // [END dialogflow_v2beta1_generated_Documents_GetDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.import_documents.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.import_documents.js
index f344e3c4dbc..32bef82a73f 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.import_documents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.import_documents.js
@@ -32,11 +32,11 @@ function main(parent, documentTemplate) {
    *  `gs://<bucket-name>/<object-name>`.
    *  `gs://<bucket-name>/<object-path>/*.<extension>`.
    */
-  // const gcsSource = ''
+  // const gcsSource = {}
   /**
    *  Required. Document template used for importing all the documents.
    */
-  // const documentTemplate = ''
+  // const documentTemplate = {}
   /**
    *  Whether to import custom metadata from Google Cloud Storage.
    *  Only valid when the document source is Google Cloud Storage URI.
@@ -49,7 +49,7 @@ function main(parent, documentTemplate) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function importDocuments() {
+  async function callImportDocuments() {
     // Construct request
     const request = {
       parent,
@@ -62,7 +62,7 @@ function main(parent, documentTemplate) {
     console.log(response);
   }
 
-  importDocuments();
+  callImportDocuments();
   // [END dialogflow_v2beta1_generated_Documents_ImportDocuments_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.list_documents.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.list_documents.js
index 805d44e2821..38a70a1c34c 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.list_documents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.list_documents.js
@@ -37,7 +37,7 @@ function main(parent) {
   /**
    *  The filter expression used to filter documents returned by the list method.
    *  The expression has the following syntax:
-   *    <field> <operator> <value> [AND <field> <operator> <value>] ...
+   *    <field> <operator> <value> AND <field> <operator> <value>  ...
    *  The following fields and operators are supported:
    *  * knowledge_types with has(:) operator
    *  * display_name with has(:) operator
@@ -49,7 +49,7 @@ function main(parent) {
    *  * "state=ACTIVE" matches documents with ACTIVE state.
    *  * "knowledge_types:FAQ AND state=ACTIVE" matches all active FAQ documents.
    *  For more information about filtering, see
-   *  [API Filtering](https://aip.dev/160).
+   *  API Filtering (https://aip.dev/160).
    */
   // const filter = 'abc123'
 
@@ -59,7 +59,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function listDocuments() {
+  async function callListDocuments() {
     // Construct request
     const request = {
       parent,
@@ -72,7 +72,7 @@ function main(parent) {
     }
   }
 
-  listDocuments();
+  callListDocuments();
   // [END dialogflow_v2beta1_generated_Documents_ListDocuments_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.reload_document.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.reload_document.js
index 0b58bf4e7de..9f3c0d1d842 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.reload_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.reload_document.js
@@ -29,7 +29,7 @@ function main(name) {
    *  The path for a Cloud Storage source file for reloading document content.
    *  If not provided, the Document's existing source will be reloaded.
    */
-  // const gcsSource = ''
+  // const gcsSource = {}
   /**
    *  Whether to import custom metadata from Google Cloud Storage.
    *  Only valid when the document source is Google Cloud Storage URI.
@@ -42,7 +42,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function reloadDocument() {
+  async function callReloadDocument() {
     // Construct request
     const request = {
       name,
@@ -54,7 +54,7 @@ function main(name) {
     console.log(response);
   }
 
-  reloadDocument();
+  callReloadDocument();
   // [END dialogflow_v2beta1_generated_Documents_ReloadDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.update_document.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.update_document.js
index fc5aec6e841..de674226ad3 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.update_document.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/documents.update_document.js
@@ -22,13 +22,13 @@ function main(document) {
   /**
    *  Required. The document to update.
    */
-  // const document = ''
+  // const document = {}
   /**
    *  Optional. Not specified means `update all`.
    *  Currently, only `display_name` can be updated, an InvalidArgument will be
    *  returned for attempting to update other fields.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {DocumentsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -36,7 +36,7 @@ function main(document) {
   // Instantiates a client
   const dialogflowClient = new DocumentsClient();
 
-  async function updateDocument() {
+  async function callUpdateDocument() {
     // Construct request
     const request = {
       document,
@@ -48,7 +48,7 @@ function main(document) {
     console.log(response);
   }
 
-  updateDocument();
+  callUpdateDocument();
   // [END dialogflow_v2beta1_generated_Documents_UpdateDocument_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_create_entities.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_create_entities.js
index 6f421960be8..0a9f120dfcd 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_create_entities.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_create_entities.js
@@ -35,8 +35,8 @@ function main(parent, entities) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
 
@@ -46,7 +46,7 @@ function main(parent, entities) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchCreateEntities() {
+  async function callBatchCreateEntities() {
     // Construct request
     const request = {
       parent,
@@ -59,7 +59,7 @@ function main(parent, entities) {
     console.log(response);
   }
 
-  batchCreateEntities();
+  callBatchCreateEntities();
   // [END dialogflow_v2beta1_generated_EntityTypes_BatchCreateEntities_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_delete_entities.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_delete_entities.js
index b9152b672e2..ed029de26a9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_delete_entities.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_delete_entities.js
@@ -37,8 +37,8 @@ function main(parent, entityValues) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
 
@@ -48,7 +48,7 @@ function main(parent, entityValues) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchDeleteEntities() {
+  async function callBatchDeleteEntities() {
     // Construct request
     const request = {
       parent,
@@ -61,7 +61,7 @@ function main(parent, entityValues) {
     console.log(response);
   }
 
-  batchDeleteEntities();
+  callBatchDeleteEntities();
   // [END dialogflow_v2beta1_generated_EntityTypes_BatchDeleteEntities_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_delete_entity_types.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_delete_entity_types.js
index 6d7c721be1d..b49200a4fc9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_delete_entity_types.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_delete_entity_types.js
@@ -38,7 +38,7 @@ function main(parent, entityTypeNames) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchDeleteEntityTypes() {
+  async function callBatchDeleteEntityTypes() {
     // Construct request
     const request = {
       parent,
@@ -51,7 +51,7 @@ function main(parent, entityTypeNames) {
     console.log(response);
   }
 
-  batchDeleteEntityTypes();
+  callBatchDeleteEntityTypes();
   // [END dialogflow_v2beta1_generated_EntityTypes_BatchDeleteEntityTypes_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_update_entities.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_update_entities.js
index 7c98966e496..f3e208ced1e 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_update_entities.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_update_entities.js
@@ -35,14 +35,14 @@ function main(parent, entities) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {EntityTypesClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -50,7 +50,7 @@ function main(parent, entities) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchUpdateEntities() {
+  async function callBatchUpdateEntities() {
     // Construct request
     const request = {
       parent,
@@ -63,7 +63,7 @@ function main(parent, entities) {
     console.log(response);
   }
 
-  batchUpdateEntities();
+  callBatchUpdateEntities();
   // [END dialogflow_v2beta1_generated_EntityTypes_BatchUpdateEntities_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_update_entity_types.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_update_entity_types.js
index b053bf0324c..dd0116622e2 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_update_entity_types.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.batch_update_entity_types.js
@@ -36,19 +36,19 @@ function main(parent) {
   /**
    *  The collection of entity types to update or create.
    */
-  // const entityTypeBatchInline = ''
+  // const entityTypeBatchInline = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {EntityTypesClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -56,7 +56,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function batchUpdateEntityTypes() {
+  async function callBatchUpdateEntityTypes() {
     // Construct request
     const request = {
       parent,
@@ -68,7 +68,7 @@ function main(parent) {
     console.log(response);
   }
 
-  batchUpdateEntityTypes();
+  callBatchUpdateEntityTypes();
   // [END dialogflow_v2beta1_generated_EntityTypes_BatchUpdateEntityTypes_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.create_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.create_entity_type.js
index c1de9ddc995..80e33c1555d 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.create_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.create_entity_type.js
@@ -29,13 +29,13 @@ function main(parent, entityType) {
   /**
    *  Required. The entity type to create.
    */
-  // const entityType = ''
+  // const entityType = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
 
@@ -45,7 +45,7 @@ function main(parent, entityType) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function createEntityType() {
+  async function callCreateEntityType() {
     // Construct request
     const request = {
       parent,
@@ -57,7 +57,7 @@ function main(parent, entityType) {
     console.log(response);
   }
 
-  createEntityType();
+  callCreateEntityType();
   // [END dialogflow_v2beta1_generated_EntityTypes_CreateEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.delete_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.delete_entity_type.js
index 4f93afdfbe3..28b5e389c0d 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.delete_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.delete_entity_type.js
@@ -34,7 +34,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function deleteEntityType() {
+  async function callDeleteEntityType() {
     // Construct request
     const request = {
       name,
@@ -45,7 +45,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteEntityType();
+  callDeleteEntityType();
   // [END dialogflow_v2beta1_generated_EntityTypes_DeleteEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.get_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.get_entity_type.js
index 37a910908c3..d32c2567ba4 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.get_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.get_entity_type.js
@@ -31,8 +31,8 @@ function main(name) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
 
@@ -42,7 +42,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function getEntityType() {
+  async function callGetEntityType() {
     // Construct request
     const request = {
       name,
@@ -53,7 +53,7 @@ function main(name) {
     console.log(response);
   }
 
-  getEntityType();
+  callGetEntityType();
   // [END dialogflow_v2beta1_generated_EntityTypes_GetEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.list_entity_types.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.list_entity_types.js
index b0bc1cfca5c..64fa4f50256 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.list_entity_types.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.list_entity_types.js
@@ -30,8 +30,8 @@ function main(parent) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
@@ -50,7 +50,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function listEntityTypes() {
+  async function callListEntityTypes() {
     // Construct request
     const request = {
       parent,
@@ -63,7 +63,7 @@ function main(parent) {
     }
   }
 
-  listEntityTypes();
+  callListEntityTypes();
   // [END dialogflow_v2beta1_generated_EntityTypes_ListEntityTypes_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.update_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.update_entity_type.js
index df8e735e082..dfe66ec97bc 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.update_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/entity_types.update_entity_type.js
@@ -22,19 +22,19 @@ function main(entityType) {
   /**
    *  Required. The entity type to update.
    */
-  // const entityType = ''
+  // const entityType = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {EntityTypesClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -42,7 +42,7 @@ function main(entityType) {
   // Instantiates a client
   const dialogflowClient = new EntityTypesClient();
 
-  async function updateEntityType() {
+  async function callUpdateEntityType() {
     // Construct request
     const request = {
       entityType,
@@ -53,7 +53,7 @@ function main(entityType) {
     console.log(response);
   }
 
-  updateEntityType();
+  callUpdateEntityType();
   // [END dialogflow_v2beta1_generated_EntityTypes_UpdateEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.create_environment.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.create_environment.js
index ba49f0b2e7d..4db9c08a5d9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.create_environment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.create_environment.js
@@ -29,7 +29,7 @@ function main(parent, environment, environmentId) {
   /**
    *  Required. The environment to create.
    */
-  // const environment = ''
+  // const environment = {}
   /**
    *  Required. The unique id of the new environment.
    */
@@ -41,7 +41,7 @@ function main(parent, environment, environmentId) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function createEnvironment() {
+  async function callCreateEnvironment() {
     // Construct request
     const request = {
       parent,
@@ -54,7 +54,7 @@ function main(parent, environment, environmentId) {
     console.log(response);
   }
 
-  createEnvironment();
+  callCreateEnvironment();
   // [END dialogflow_v2beta1_generated_Environments_CreateEnvironment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.delete_environment.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.delete_environment.js
index 72e91733e86..6c16cedf626 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.delete_environment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.delete_environment.js
@@ -34,7 +34,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function deleteEnvironment() {
+  async function callDeleteEnvironment() {
     // Construct request
     const request = {
       name,
@@ -45,7 +45,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteEnvironment();
+  callDeleteEnvironment();
   // [END dialogflow_v2beta1_generated_Environments_DeleteEnvironment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.get_environment.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.get_environment.js
index 70ab6b2eddb..ce28c8707c0 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.get_environment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.get_environment.js
@@ -34,7 +34,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function getEnvironment() {
+  async function callGetEnvironment() {
     // Construct request
     const request = {
       name,
@@ -45,7 +45,7 @@ function main(name) {
     console.log(response);
   }
 
-  getEnvironment();
+  callGetEnvironment();
   // [END dialogflow_v2beta1_generated_Environments_GetEnvironment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.get_environment_history.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.get_environment_history.js
index 16a1061c74e..291c8a03bb0 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.get_environment_history.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.get_environment_history.js
@@ -43,7 +43,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function getEnvironmentHistory() {
+  async function callGetEnvironmentHistory() {
     // Construct request
     const request = {
       parent,
@@ -56,7 +56,7 @@ function main(parent) {
     }
   }
 
-  getEnvironmentHistory();
+  callGetEnvironmentHistory();
   // [END dialogflow_v2beta1_generated_Environments_GetEnvironmentHistory_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.list_environments.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.list_environments.js
index 6c0af68dafe..6bbee880287 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.list_environments.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.list_environments.js
@@ -42,7 +42,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function listEnvironments() {
+  async function callListEnvironments() {
     // Construct request
     const request = {
       parent,
@@ -55,7 +55,7 @@ function main(parent) {
     }
   }
 
-  listEnvironments();
+  callListEnvironments();
   // [END dialogflow_v2beta1_generated_Environments_ListEnvironments_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.update_environment.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.update_environment.js
index b1e5e4585f5..77e0d94731f 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.update_environment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/environments.update_environment.js
@@ -22,11 +22,11 @@ function main(environment, updateMask) {
   /**
    *  Required. The environment to update.
    */
-  // const environment = ''
+  // const environment = {}
   /**
    *  Required. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
   /**
    *  Optional. This field is used to prevent accidental overwrite of the draft
    *  environment, which is an operation that cannot be undone. To confirm that
@@ -41,7 +41,7 @@ function main(environment, updateMask) {
   // Instantiates a client
   const dialogflowClient = new EnvironmentsClient();
 
-  async function updateEnvironment() {
+  async function callUpdateEnvironment() {
     // Construct request
     const request = {
       environment,
@@ -53,7 +53,7 @@ function main(environment, updateMask) {
     console.log(response);
   }
 
-  updateEnvironment();
+  callUpdateEnvironment();
   // [END dialogflow_v2beta1_generated_Environments_UpdateEnvironment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/fulfillments.get_fulfillment.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/fulfillments.get_fulfillment.js
index 0e9f5783d4a..fc44c0c800a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/fulfillments.get_fulfillment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/fulfillments.get_fulfillment.js
@@ -33,7 +33,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new FulfillmentsClient();
 
-  async function getFulfillment() {
+  async function callGetFulfillment() {
     // Construct request
     const request = {
       name,
@@ -44,7 +44,7 @@ function main(name) {
     console.log(response);
   }
 
-  getFulfillment();
+  callGetFulfillment();
   // [END dialogflow_v2beta1_generated_Fulfillments_GetFulfillment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/fulfillments.update_fulfillment.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/fulfillments.update_fulfillment.js
index 4d9394194eb..951ce822edc 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/fulfillments.update_fulfillment.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/fulfillments.update_fulfillment.js
@@ -22,12 +22,12 @@ function main(fulfillment, updateMask) {
   /**
    *  Required. The fulfillment to update.
    */
-  // const fulfillment = ''
+  // const fulfillment = {}
   /**
    *  Required. The mask to control which fields get updated. If the mask is not
    *  present, all fields will be updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {FulfillmentsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -35,7 +35,7 @@ function main(fulfillment, updateMask) {
   // Instantiates a client
   const dialogflowClient = new FulfillmentsClient();
 
-  async function updateFulfillment() {
+  async function callUpdateFulfillment() {
     // Construct request
     const request = {
       fulfillment,
@@ -47,7 +47,7 @@ function main(fulfillment, updateMask) {
     console.log(response);
   }
 
-  updateFulfillment();
+  callUpdateFulfillment();
   // [END dialogflow_v2beta1_generated_Fulfillments_UpdateFulfillment_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.batch_delete_intents.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.batch_delete_intents.js
index f421cd7a8f4..78bc7f381ab 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.batch_delete_intents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.batch_delete_intents.js
@@ -38,7 +38,7 @@ function main(parent, intents) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function batchDeleteIntents() {
+  async function callBatchDeleteIntents() {
     // Construct request
     const request = {
       parent,
@@ -51,7 +51,7 @@ function main(parent, intents) {
     console.log(response);
   }
 
-  batchDeleteIntents();
+  callBatchDeleteIntents();
   // [END dialogflow_v2beta1_generated_Intents_BatchDeleteIntents_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.batch_update_intents.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.batch_update_intents.js
index 954f927a4f0..4b60e136b6a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.batch_update_intents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.batch_update_intents.js
@@ -35,23 +35,23 @@ function main(parent) {
   /**
    *  The collection of intents to update or create.
    */
-  // const intentBatchInline = ''
+  // const intentBatchInline = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
 
   // Imports the Dialogflow library
   const {IntentsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -59,7 +59,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function batchUpdateIntents() {
+  async function callBatchUpdateIntents() {
     // Construct request
     const request = {
       parent,
@@ -71,7 +71,7 @@ function main(parent) {
     console.log(response);
   }
 
-  batchUpdateIntents();
+  callBatchUpdateIntents();
   // [END dialogflow_v2beta1_generated_Intents_BatchUpdateIntents_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.create_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.create_intent.js
index 4c685df32d9..5871020e55e 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.create_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.create_intent.js
@@ -29,19 +29,19 @@ function main(parent, intent) {
   /**
    *  Required. The intent to create.
    */
-  // const intent = ''
+  // const intent = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
 
   // Imports the Dialogflow library
   const {IntentsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -49,7 +49,7 @@ function main(parent, intent) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function createIntent() {
+  async function callCreateIntent() {
     // Construct request
     const request = {
       parent,
@@ -61,7 +61,7 @@ function main(parent, intent) {
     console.log(response);
   }
 
-  createIntent();
+  callCreateIntent();
   // [END dialogflow_v2beta1_generated_Intents_CreateIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.delete_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.delete_intent.js
index 8c13437d783..65936120ad9 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.delete_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.delete_intent.js
@@ -34,7 +34,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function deleteIntent() {
+  async function callDeleteIntent() {
     // Construct request
     const request = {
       name,
@@ -45,7 +45,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteIntent();
+  callDeleteIntent();
   // [END dialogflow_v2beta1_generated_Intents_DeleteIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.get_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.get_intent.js
index de18d612635..424dc56aa85 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.get_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.get_intent.js
@@ -30,14 +30,14 @@ function main(name) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
 
   // Imports the Dialogflow library
   const {IntentsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -45,7 +45,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function getIntent() {
+  async function callGetIntent() {
     // Construct request
     const request = {
       name,
@@ -56,7 +56,7 @@ function main(name) {
     console.log(response);
   }
 
-  getIntent();
+  callGetIntent();
   // [END dialogflow_v2beta1_generated_Intents_GetIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.list_intents.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.list_intents.js
index 623c395a488..80d7238c213 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.list_intents.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.list_intents.js
@@ -35,14 +35,14 @@ function main(parent) {
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
   /**
    *  Optional. The maximum number of items to return in a single page. By
    *  default 100 and at most 1000.
@@ -59,7 +59,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function listIntents() {
+  async function callListIntents() {
     // Construct request
     const request = {
       parent,
@@ -72,7 +72,7 @@ function main(parent) {
     }
   }
 
-  listIntents();
+  callListIntents();
   // [END dialogflow_v2beta1_generated_Intents_ListIntents_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.update_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.update_intent.js
index 989524e851f..92481ef3544 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.update_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/intents.update_intent.js
@@ -22,23 +22,23 @@ function main(intent) {
   /**
    *  Required. The intent to update.
    */
-  // const intent = ''
+  // const intent = {}
   /**
    *  Optional. The language used to access language-specific data.
    *  If not specified, the agent's default language is used.
    *  For more information, see
-   *  [Multilingual intent and entity
-   *  data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   *  Multilingual intent and entity
+   *  data (https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
    */
   // const languageCode = 'abc123'
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
   /**
    *  Optional. The resource view to apply to the returned intent.
    */
-  // const intentView = ''
+  // const intentView = {}
 
   // Imports the Dialogflow library
   const {IntentsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -46,7 +46,7 @@ function main(intent) {
   // Instantiates a client
   const dialogflowClient = new IntentsClient();
 
-  async function updateIntent() {
+  async function callUpdateIntent() {
     // Construct request
     const request = {
       intent,
@@ -57,7 +57,7 @@ function main(intent) {
     console.log(response);
   }
 
-  updateIntent();
+  callUpdateIntent();
   // [END dialogflow_v2beta1_generated_Intents_UpdateIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.create_knowledge_base.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.create_knowledge_base.js
index 4a3a79cab4b..4e3a170d3e5 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.create_knowledge_base.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.create_knowledge_base.js
@@ -27,7 +27,7 @@ function main(parent, knowledgeBase) {
   /**
    *  Required. The knowledge base to create.
    */
-  // const knowledgeBase = ''
+  // const knowledgeBase = {}
 
   // Imports the Dialogflow library
   const {KnowledgeBasesClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -35,7 +35,7 @@ function main(parent, knowledgeBase) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function createKnowledgeBase() {
+  async function callCreateKnowledgeBase() {
     // Construct request
     const request = {
       parent,
@@ -47,7 +47,7 @@ function main(parent, knowledgeBase) {
     console.log(response);
   }
 
-  createKnowledgeBase();
+  callCreateKnowledgeBase();
   // [END dialogflow_v2beta1_generated_KnowledgeBases_CreateKnowledgeBase_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.delete_knowledge_base.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.delete_knowledge_base.js
index 3bd604aed87..59541a1dda6 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.delete_knowledge_base.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.delete_knowledge_base.js
@@ -37,7 +37,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function deleteKnowledgeBase() {
+  async function callDeleteKnowledgeBase() {
     // Construct request
     const request = {
       name,
@@ -48,7 +48,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteKnowledgeBase();
+  callDeleteKnowledgeBase();
   // [END dialogflow_v2beta1_generated_KnowledgeBases_DeleteKnowledgeBase_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.get_knowledge_base.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.get_knowledge_base.js
index de08c5d36f1..8bb6c80c670 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.get_knowledge_base.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.get_knowledge_base.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function getKnowledgeBase() {
+  async function callGetKnowledgeBase() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getKnowledgeBase();
+  callGetKnowledgeBase();
   // [END dialogflow_v2beta1_generated_KnowledgeBases_GetKnowledgeBase_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.list_knowledge_bases.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.list_knowledge_bases.js
index 1d250f303a3..fcbcfded9e5 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.list_knowledge_bases.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.list_knowledge_bases.js
@@ -36,7 +36,7 @@ function main(parent) {
   /**
    *  The filter expression used to filter knowledge bases returned by the list
    *  method. The expression has the following syntax:
-   *    <field> <operator> <value> [AND <field> <operator> <value>] ...
+   *    <field> <operator> <value> AND <field> <operator> <value>  ...
    *  The following fields and operators are supported:
    *  * display_name with has(:) operator
    *  * language_code with equals(=) operator
@@ -52,7 +52,7 @@ function main(parent) {
    *  Note: An empty filter string (i.e. "") is a no-op and will result in no
    *  filtering.
    *  For more information about filtering, see
-   *  [API Filtering](https://aip.dev/160).
+   *  API Filtering (https://aip.dev/160).
    */
   // const filter = 'abc123'
 
@@ -62,7 +62,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function listKnowledgeBases() {
+  async function callListKnowledgeBases() {
     // Construct request
     const request = {
       parent,
@@ -75,7 +75,7 @@ function main(parent) {
     }
   }
 
-  listKnowledgeBases();
+  callListKnowledgeBases();
   // [END dialogflow_v2beta1_generated_KnowledgeBases_ListKnowledgeBases_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.update_knowledge_base.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.update_knowledge_base.js
index 612286eb264..14b8f00fffa 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.update_knowledge_base.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/knowledge_bases.update_knowledge_base.js
@@ -22,13 +22,13 @@ function main(knowledgeBase) {
   /**
    *  Required. The knowledge base to update.
    */
-  // const knowledgeBase = ''
+  // const knowledgeBase = {}
   /**
    *  Optional. Not specified means `update all`.
    *  Currently, only `display_name` can be updated, an InvalidArgument will be
    *  returned for attempting to update other fields.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {KnowledgeBasesClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -36,7 +36,7 @@ function main(knowledgeBase) {
   // Instantiates a client
   const dialogflowClient = new KnowledgeBasesClient();
 
-  async function updateKnowledgeBase() {
+  async function callUpdateKnowledgeBase() {
     // Construct request
     const request = {
       knowledgeBase,
@@ -47,7 +47,7 @@ function main(knowledgeBase) {
     console.log(response);
   }
 
-  updateKnowledgeBase();
+  callUpdateKnowledgeBase();
   // [END dialogflow_v2beta1_generated_KnowledgeBases_UpdateKnowledgeBase_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.analyze_content.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.analyze_content.js
index 230e78835c1..5b7343df13c 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.analyze_content.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.analyze_content.js
@@ -28,11 +28,11 @@ function main(participant) {
   /**
    *  The natural language text to be processed.
    */
-  // const textInput = ''
+  // const textInput = {}
   /**
    *  An input event to send to Dialogflow.
    */
-  // const eventInput = ''
+  // const eventInput = {}
   /**
    *  Speech synthesis configuration.
    *  The speech synthesis settings for a virtual agent that may be configured
@@ -40,11 +40,11 @@ function main(participant) {
    *  AnalyzeContent. If this configuration is not supplied, speech synthesis
    *  is disabled.
    */
-  // const replyAudioConfig = ''
+  // const replyAudioConfig = {}
   /**
    *  Parameters for a Dialogflow virtual-agent query.
    */
-  // const queryParams = ''
+  // const queryParams = {}
   /**
    *  Optional. The send time of the message from end user or human agent's
    *  perspective. It is used for identifying the same message under one
@@ -59,7 +59,7 @@ function main(participant) {
    *  If the value is not provided, a new request will always be regarded as a
    *  new message without any de-duplication.
    */
-  // const messageSendTime = ''
+  // const messageSendTime = {}
   /**
    *  A unique identifier for this request. Restricted to 36 ASCII characters.
    *  A random UUID is recommended.
@@ -73,7 +73,7 @@ function main(participant) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function analyzeContent() {
+  async function callAnalyzeContent() {
     // Construct request
     const request = {
       participant,
@@ -84,7 +84,7 @@ function main(participant) {
     console.log(response);
   }
 
-  analyzeContent();
+  callAnalyzeContent();
   // [END dialogflow_v2beta1_generated_Participants_AnalyzeContent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.compile_suggestion.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.compile_suggestion.js
index fa3f0df95d2..342475f8e91 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.compile_suggestion.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.compile_suggestion.js
@@ -34,7 +34,7 @@ function main() {
   // const latestMessage = 'abc123'
   /**
    *  Optional. Max number of messages prior to and including
-   *  [latest_message] to use as context when compiling the
+   *  latest_message  to use as context when compiling the
    *  suggestion. If zero or less than zero, 20 is used.
    */
   // const contextSize = 1234
@@ -45,7 +45,7 @@ function main() {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function compileSuggestion() {
+  async function callCompileSuggestion() {
     // Construct request
     const request = {};
 
@@ -54,7 +54,7 @@ function main() {
     console.log(response);
   }
 
-  compileSuggestion();
+  callCompileSuggestion();
   // [END dialogflow_v2beta1_generated_Participants_CompileSuggestion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.create_participant.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.create_participant.js
index 1e0dafd5fc2..e4e68205ebc 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.create_participant.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.create_participant.js
@@ -28,7 +28,7 @@ function main(parent, participant) {
   /**
    *  Required. The participant to create.
    */
-  // const participant = ''
+  // const participant = {}
 
   // Imports the Dialogflow library
   const {ParticipantsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -36,7 +36,7 @@ function main(parent, participant) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function createParticipant() {
+  async function callCreateParticipant() {
     // Construct request
     const request = {
       parent,
@@ -48,7 +48,7 @@ function main(parent, participant) {
     console.log(response);
   }
 
-  createParticipant();
+  callCreateParticipant();
   // [END dialogflow_v2beta1_generated_Participants_CreateParticipant_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.get_participant.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.get_participant.js
index 98163612354..de8ad47233a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.get_participant.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.get_participant.js
@@ -32,7 +32,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function getParticipant() {
+  async function callGetParticipant() {
     // Construct request
     const request = {
       name,
@@ -43,7 +43,7 @@ function main(name) {
     console.log(response);
   }
 
-  getParticipant();
+  callGetParticipant();
   // [END dialogflow_v2beta1_generated_Participants_GetParticipant_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.list_participants.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.list_participants.js
index a350dacafd6..2632913f290 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.list_participants.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.list_participants.js
@@ -41,7 +41,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function listParticipants() {
+  async function callListParticipants() {
     // Construct request
     const request = {
       parent,
@@ -54,7 +54,7 @@ function main(parent) {
     }
   }
 
-  listParticipants();
+  callListParticipants();
   // [END dialogflow_v2beta1_generated_Participants_ListParticipants_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.list_suggestions.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.list_suggestions.js
index 22129daf5a7..a2a896054dc 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.list_suggestions.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.list_suggestions.js
@@ -41,7 +41,7 @@ function main() {
    *  `create_time_epoch_microseconds > 1551790877964485` or
    *  `create_time > "2017-01-15T01:30:15.01Z"`
    *  For more information about filtering, see
-   *  [API Filtering](https://aip.dev/160).
+   *  API Filtering (https://aip.dev/160).
    */
   // const filter = 'abc123'
 
@@ -51,7 +51,7 @@ function main() {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function listSuggestions() {
+  async function callListSuggestions() {
     // Construct request
     const request = {};
 
@@ -62,7 +62,7 @@ function main() {
     }
   }
 
-  listSuggestions();
+  callListSuggestions();
   // [END dialogflow_v2beta1_generated_Participants_ListSuggestions_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_articles.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_articles.js
index e3f3e96e32d..5f37c18c4d5 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_articles.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_articles.js
@@ -34,7 +34,7 @@ function main(parent) {
   // const latestMessage = 'abc123'
   /**
    *  Optional. Max number of messages prior to and including
-   *  [latest_message][google.cloud.dialogflow.v2beta1.SuggestArticlesRequest.latest_message] to use as context
+   *  latest_message google.cloud.dialogflow.v2beta1.SuggestArticlesRequest.latest_message  to use as context
    *  when compiling the suggestion. By default 20 and at most 50.
    */
   // const contextSize = 1234
@@ -45,7 +45,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function suggestArticles() {
+  async function callSuggestArticles() {
     // Construct request
     const request = {
       parent,
@@ -56,7 +56,7 @@ function main(parent) {
     console.log(response);
   }
 
-  suggestArticles();
+  callSuggestArticles();
   // [END dialogflow_v2beta1_generated_Participants_SuggestArticles_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_faq_answers.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_faq_answers.js
index ff7419af66c..f6732ce3597 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_faq_answers.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_faq_answers.js
@@ -34,7 +34,7 @@ function main(parent) {
   // const latestMessage = 'abc123'
   /**
    *  Optional. Max number of messages prior to and including
-   *  [latest_message] to use as context when compiling the
+   *  latest_message  to use as context when compiling the
    *  suggestion. By default 20 and at most 50.
    */
   // const contextSize = 1234
@@ -45,7 +45,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function suggestFaqAnswers() {
+  async function callSuggestFaqAnswers() {
     // Construct request
     const request = {
       parent,
@@ -56,7 +56,7 @@ function main(parent) {
     console.log(response);
   }
 
-  suggestFaqAnswers();
+  callSuggestFaqAnswers();
   // [END dialogflow_v2beta1_generated_Participants_SuggestFaqAnswers_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_smart_replies.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_smart_replies.js
index 259ca77ddd1..11b45a09ff3 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_smart_replies.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.suggest_smart_replies.js
@@ -30,7 +30,7 @@ function main(parent) {
    *  for. This provides a way for user to get follow up smart reply suggestion
    *  after a smart reply selection, without sending a text message.
    */
-  // const currentTextInput = ''
+  // const currentTextInput = {}
   /**
    *  The name of the latest conversation message to compile suggestion
    *  for. If empty, it will be the latest message of the conversation.
@@ -40,7 +40,7 @@ function main(parent) {
   // const latestMessage = 'abc123'
   /**
    *  Optional. Max number of messages prior to and including
-   *  [latest_message] to use as context when compiling the
+   *  latest_message  to use as context when compiling the
    *  suggestion. By default 20 and at most 50.
    */
   // const contextSize = 1234
@@ -51,7 +51,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function suggestSmartReplies() {
+  async function callSuggestSmartReplies() {
     // Construct request
     const request = {
       parent,
@@ -62,7 +62,7 @@ function main(parent) {
     console.log(response);
   }
 
-  suggestSmartReplies();
+  callSuggestSmartReplies();
   // [END dialogflow_v2beta1_generated_Participants_SuggestSmartReplies_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.update_participant.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.update_participant.js
index 0ef6f16f1c2..4422d4ea6dd 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.update_participant.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/participants.update_participant.js
@@ -22,11 +22,11 @@ function main(participant, updateMask) {
   /**
    *  Required. The participant to update.
    */
-  // const participant = ''
+  // const participant = {}
   /**
    *  Required. The mask to specify which fields to update.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {ParticipantsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -34,7 +34,7 @@ function main(participant, updateMask) {
   // Instantiates a client
   const dialogflowClient = new ParticipantsClient();
 
-  async function updateParticipant() {
+  async function callUpdateParticipant() {
     // Construct request
     const request = {
       participant,
@@ -46,7 +46,7 @@ function main(participant, updateMask) {
     console.log(response);
   }
 
-  updateParticipant();
+  callUpdateParticipant();
   // [END dialogflow_v2beta1_generated_Participants_UpdateParticipant_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.create_session_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.create_session_entity_type.js
index 56f85597e72..7d691ff0819 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.create_session_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.create_session_entity_type.js
@@ -38,7 +38,7 @@ function main(parent, sessionEntityType) {
   /**
    *  Required. The session entity type to create.
    */
-  // const sessionEntityType = ''
+  // const sessionEntityType = {}
 
   // Imports the Dialogflow library
   const {SessionEntityTypesClient} =
@@ -47,7 +47,7 @@ function main(parent, sessionEntityType) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function createSessionEntityType() {
+  async function callCreateSessionEntityType() {
     // Construct request
     const request = {
       parent,
@@ -59,7 +59,7 @@ function main(parent, sessionEntityType) {
     console.log(response);
   }
 
-  createSessionEntityType();
+  callCreateSessionEntityType();
   // [END dialogflow_v2beta1_generated_SessionEntityTypes_CreateSessionEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.delete_session_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.delete_session_entity_type.js
index 0907aae9a10..10c3b907f16 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.delete_session_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.delete_session_entity_type.js
@@ -44,7 +44,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function deleteSessionEntityType() {
+  async function callDeleteSessionEntityType() {
     // Construct request
     const request = {
       name,
@@ -55,7 +55,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteSessionEntityType();
+  callDeleteSessionEntityType();
   // [END dialogflow_v2beta1_generated_SessionEntityTypes_DeleteSessionEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.get_session_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.get_session_entity_type.js
index 4e3ee7d2ab2..71b4131da2d 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.get_session_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.get_session_entity_type.js
@@ -43,7 +43,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function getSessionEntityType() {
+  async function callGetSessionEntityType() {
     // Construct request
     const request = {
       name,
@@ -54,7 +54,7 @@ function main(name) {
     console.log(response);
   }
 
-  getSessionEntityType();
+  callGetSessionEntityType();
   // [END dialogflow_v2beta1_generated_SessionEntityTypes_GetSessionEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.list_session_entity_types.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.list_session_entity_types.js
index 0bfe7136867..ce2dd656995 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.list_session_entity_types.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.list_session_entity_types.js
@@ -52,7 +52,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function listSessionEntityTypes() {
+  async function callListSessionEntityTypes() {
     // Construct request
     const request = {
       parent,
@@ -67,7 +67,7 @@ function main(parent) {
     }
   }
 
-  listSessionEntityTypes();
+  callListSessionEntityTypes();
   // [END dialogflow_v2beta1_generated_SessionEntityTypes_ListSessionEntityTypes_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.update_session_entity_type.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.update_session_entity_type.js
index d4b0f42ac68..535f5e45c00 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.update_session_entity_type.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/session_entity_types.update_session_entity_type.js
@@ -22,11 +22,11 @@ function main(sessionEntityType) {
   /**
    *  Required. The session entity type to update.
    */
-  // const sessionEntityType = ''
+  // const sessionEntityType = {}
   /**
    *  Optional. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {SessionEntityTypesClient} =
@@ -35,7 +35,7 @@ function main(sessionEntityType) {
   // Instantiates a client
   const dialogflowClient = new SessionEntityTypesClient();
 
-  async function updateSessionEntityType() {
+  async function callUpdateSessionEntityType() {
     // Construct request
     const request = {
       sessionEntityType,
@@ -46,7 +46,7 @@ function main(sessionEntityType) {
     console.log(response);
   }
 
-  updateSessionEntityType();
+  callUpdateSessionEntityType();
   // [END dialogflow_v2beta1_generated_SessionEntityTypes_UpdateSessionEntityType_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/sessions.detect_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/sessions.detect_intent.js
index e6356276c16..286b4aecc72 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/sessions.detect_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/sessions.detect_intent.js
@@ -36,17 +36,17 @@ function main(session, queryInput) {
    *  to choose an appropriate `Session ID` and `User Id`. They can be a random
    *  number or some type of user and session identifiers (preferably hashed).
    *  The length of the `Session ID` and `User ID` must not exceed 36 characters.
-   *  For more information, see the [API interactions
-   *  guide](https://cloud.google.com/dialogflow/docs/api-overview).
+   *  For more information, see the API interactions
+   *  guide (https://cloud.google.com/dialogflow/docs/api-overview).
    *  Note: Always use agent versions for production traffic.
-   *  See [Versions and
-   *  environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
+   *  See Versions and
+   *  environments (https://cloud.google.com/dialogflow/es/docs/agents-versions).
    */
   // const session = 'abc123'
   /**
    *  The parameters of this query.
    */
-  // const queryParams = ''
+  // const queryParams = {}
   /**
    *  Required. The input specification. It can be set to:
    *  1.  an audio config
@@ -54,21 +54,21 @@ function main(session, queryInput) {
    *  2.  a conversational query in the form of text, or
    *  3.  an event that specifies which intent to trigger.
    */
-  // const queryInput = ''
+  // const queryInput = {}
   /**
    *  Instructs the speech synthesizer how to generate the output
    *  audio. If this field is not set and agent-level speech synthesizer is not
    *  configured, no output audio is generated.
    */
-  // const outputAudioConfig = ''
+  // const outputAudioConfig = {}
   /**
-   *  Mask for [output_audio_config][google.cloud.dialogflow.v2beta1.DetectIntentRequest.output_audio_config] indicating which settings in this
+   *  Mask for output_audio_config google.cloud.dialogflow.v2beta1.DetectIntentRequest.output_audio_config  indicating which settings in this
    *  request-level config should override speech synthesizer settings defined at
    *  agent-level.
-   *  If unspecified or empty, [output_audio_config][google.cloud.dialogflow.v2beta1.DetectIntentRequest.output_audio_config] replaces the agent-level
+   *  If unspecified or empty, output_audio_config google.cloud.dialogflow.v2beta1.DetectIntentRequest.output_audio_config  replaces the agent-level
    *  config in its entirety.
    */
-  // const outputAudioConfigMask = ''
+  // const outputAudioConfigMask = {}
   /**
    *  The natural language speech audio to be processed. This field
    *  should be populated iff `query_input` is set to an input audio config.
@@ -82,7 +82,7 @@ function main(session, queryInput) {
   // Instantiates a client
   const dialogflowClient = new SessionsClient();
 
-  async function detectIntent() {
+  async function callDetectIntent() {
     // Construct request
     const request = {
       session,
@@ -94,7 +94,7 @@ function main(session, queryInput) {
     console.log(response);
   }
 
-  detectIntent();
+  callDetectIntent();
   // [END dialogflow_v2beta1_generated_Sessions_DetectIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/sessions.streaming_detect_intent.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/sessions.streaming_detect_intent.js
index b7e6bc05cab..7fb3009cd9a 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/sessions.streaming_detect_intent.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/sessions.streaming_detect_intent.js
@@ -36,17 +36,17 @@ function main(session, queryInput) {
    *  to choose an appropriate `Session ID` and `User Id`. They can be a random
    *  number or some type of user and session identifiers (preferably hashed).
    *  The length of the `Session ID` and `User ID` must not exceed 36 characters.
-   *  For more information, see the [API interactions
-   *  guide](https://cloud.google.com/dialogflow/docs/api-overview).
+   *  For more information, see the API interactions
+   *  guide (https://cloud.google.com/dialogflow/docs/api-overview).
    *  Note: Always use agent versions for production traffic.
-   *  See [Versions and
-   *  environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
+   *  See Versions and
+   *  environments (https://cloud.google.com/dialogflow/es/docs/agents-versions).
    */
   // const session = 'abc123'
   /**
    *  The parameters of this query.
    */
-  // const queryParams = ''
+  // const queryParams = {}
   /**
    *  Required. The input specification. It can be set to:
    *  1.  an audio config which instructs the speech recognizer how to process
@@ -54,9 +54,9 @@ function main(session, queryInput) {
    *  2.  a conversational query in the form of text, or
    *  3.  an event that specifies which intent to trigger.
    */
-  // const queryInput = ''
+  // const queryInput = {}
   /**
-   *  DEPRECATED. Please use [InputAudioConfig.single_utterance][google.cloud.dialogflow.v2beta1.InputAudioConfig.single_utterance] instead.
+   *  DEPRECATED. Please use InputAudioConfig.single_utterance google.cloud.dialogflow.v2beta1.InputAudioConfig.single_utterance  instead.
    *  If `false` (default), recognition does not cease until the
    *  client closes the stream.
    *  If `true`, the recognizer will detect a single spoken utterance in input
@@ -72,15 +72,15 @@ function main(session, queryInput) {
    *  audio. If this field is not set and agent-level speech synthesizer is not
    *  configured, no output audio is generated.
    */
-  // const outputAudioConfig = ''
+  // const outputAudioConfig = {}
   /**
-   *  Mask for [output_audio_config][google.cloud.dialogflow.v2beta1.StreamingDetectIntentRequest.output_audio_config] indicating which settings in this
+   *  Mask for output_audio_config google.cloud.dialogflow.v2beta1.StreamingDetectIntentRequest.output_audio_config  indicating which settings in this
    *  request-level config should override speech synthesizer settings defined at
    *  agent-level.
-   *  If unspecified or empty, [output_audio_config][google.cloud.dialogflow.v2beta1.StreamingDetectIntentRequest.output_audio_config] replaces the agent-level
+   *  If unspecified or empty, output_audio_config google.cloud.dialogflow.v2beta1.StreamingDetectIntentRequest.output_audio_config  replaces the agent-level
    *  config in its entirety.
    */
-  // const outputAudioConfigMask = ''
+  // const outputAudioConfigMask = {}
   /**
    *  The input audio content to be recognized. Must be sent if
    *  `query_input` was set to a streaming input audio config. The complete audio
@@ -94,7 +94,7 @@ function main(session, queryInput) {
   // Instantiates a client
   const dialogflowClient = new SessionsClient();
 
-  async function streamingDetectIntent() {
+  async function callStreamingDetectIntent() {
     // Construct request
     const request = {
       session,
@@ -116,7 +116,7 @@ function main(session, queryInput) {
     stream.end();
   }
 
-  streamingDetectIntent();
+  callStreamingDetectIntent();
   // [END dialogflow_v2beta1_generated_Sessions_StreamingDetectIntent_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.create_version.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.create_version.js
index f7dca439df6..b70d02bf146 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.create_version.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.create_version.js
@@ -29,7 +29,7 @@ function main(parent, version) {
   /**
    *  Required. The version to create.
    */
-  // const version = ''
+  // const version = {}
 
   // Imports the Dialogflow library
   const {VersionsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -37,7 +37,7 @@ function main(parent, version) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function createVersion() {
+  async function callCreateVersion() {
     // Construct request
     const request = {
       parent,
@@ -49,7 +49,7 @@ function main(parent, version) {
     console.log(response);
   }
 
-  createVersion();
+  callCreateVersion();
   // [END dialogflow_v2beta1_generated_Versions_CreateVersion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.delete_version.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.delete_version.js
index 7476b5a4953..a29cade5375 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.delete_version.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.delete_version.js
@@ -34,7 +34,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function deleteVersion() {
+  async function callDeleteVersion() {
     // Construct request
     const request = {
       name,
@@ -45,7 +45,7 @@ function main(name) {
     console.log(response);
   }
 
-  deleteVersion();
+  callDeleteVersion();
   // [END dialogflow_v2beta1_generated_Versions_DeleteVersion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.get_version.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.get_version.js
index b3237c0db91..87060fe11d0 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.get_version.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.get_version.js
@@ -34,7 +34,7 @@ function main(name) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function getVersion() {
+  async function callGetVersion() {
     // Construct request
     const request = {
       name,
@@ -45,7 +45,7 @@ function main(name) {
     console.log(response);
   }
 
-  getVersion();
+  callGetVersion();
   // [END dialogflow_v2beta1_generated_Versions_GetVersion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.list_versions.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.list_versions.js
index 4d8673cd84f..61014bb7304 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.list_versions.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.list_versions.js
@@ -42,7 +42,7 @@ function main(parent) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function listVersions() {
+  async function callListVersions() {
     // Construct request
     const request = {
       parent,
@@ -55,7 +55,7 @@ function main(parent) {
     }
   }
 
-  listVersions();
+  callListVersions();
   // [END dialogflow_v2beta1_generated_Versions_ListVersions_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.update_version.js b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.update_version.js
index 17c200d0282..90cac68a72b 100644
--- a/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.update_version.js
+++ b/packages/google-cloud-dialogflow/samples/generated/v2beta1/versions.update_version.js
@@ -26,11 +26,11 @@ function main(version, updateMask) {
    *  - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
    *    ID>`
    */
-  // const version = ''
+  // const version = {}
   /**
    *  Required. The mask to control which fields get updated.
    */
-  // const updateMask = ''
+  // const updateMask = {}
 
   // Imports the Dialogflow library
   const {VersionsClient} = require('@google-cloud/dialogflow').v2beta1;
@@ -38,7 +38,7 @@ function main(version, updateMask) {
   // Instantiates a client
   const dialogflowClient = new VersionsClient();
 
-  async function updateVersion() {
+  async function callUpdateVersion() {
     // Construct request
     const request = {
       version,
@@ -50,7 +50,7 @@ function main(version, updateMask) {
     console.log(response);
   }
 
-  updateVersion();
+  callUpdateVersion();
   // [END dialogflow_v2beta1_generated_Versions_UpdateVersion_async]
 }
 
diff --git a/packages/google-cloud-dialogflow/src/v2/agents_client.ts b/packages/google-cloud-dialogflow/src/v2/agents_client.ts
index dbfdd13a9cc..970c414dc03 100644
--- a/packages/google-cloud-dialogflow/src/v2/agents_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/agents_client.ts
@@ -508,6 +508,24 @@ export class AgentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent to fetch is associated with.
+   *   Format: `projects/<Project ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Agent]{@link google.cloud.dialogflow.v2.Agent}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/agents.get_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_GetAgent_async
+   */
   getAgent(
     request?: protos.google.cloud.dialogflow.v2.IGetAgentRequest,
     options?: CallOptions
@@ -535,24 +553,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent to fetch is associated with.
-   *   Format: `projects/<Project ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Agent]{@link google.cloud.dialogflow.v2.Agent}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getAgent(request);
-   */
   getAgent(
     request?: protos.google.cloud.dialogflow.v2.IGetAgentRequest,
     optionsOrCallback?:
@@ -592,6 +592,29 @@ export class AgentsClient {
     this.initialize();
     return this.innerApiCalls.getAgent(request, options, callback);
   }
+  /**
+   * Creates/updates the specified agent.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.Agent} request.agent
+   *   Required. The agent to update.
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Agent]{@link google.cloud.dialogflow.v2.Agent}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/agents.set_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_SetAgent_async
+   */
   setAgent(
     request?: protos.google.cloud.dialogflow.v2.ISetAgentRequest,
     options?: CallOptions
@@ -619,29 +642,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates/updates the specified agent.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.Agent} request.agent
-   *   Required. The agent to update.
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Agent]{@link google.cloud.dialogflow.v2.Agent}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.setAgent(request);
-   */
   setAgent(
     request?: protos.google.cloud.dialogflow.v2.ISetAgentRequest,
     optionsOrCallback?:
@@ -681,6 +681,24 @@ export class AgentsClient {
     this.initialize();
     return this.innerApiCalls.setAgent(request, options, callback);
   }
+  /**
+   * Deletes the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent to delete is associated with.
+   *   Format: `projects/<Project ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/agents.delete_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_DeleteAgent_async
+   */
   deleteAgent(
     request?: protos.google.cloud.dialogflow.v2.IDeleteAgentRequest,
     options?: CallOptions
@@ -708,24 +726,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent to delete is associated with.
-   *   Format: `projects/<Project ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteAgent(request);
-   */
   deleteAgent(
     request?: protos.google.cloud.dialogflow.v2.IDeleteAgentRequest,
     optionsOrCallback?:
@@ -767,6 +767,31 @@ export class AgentsClient {
     this.initialize();
     return this.innerApiCalls.deleteAgent(request, options, callback);
   }
+  /**
+   * Gets agent validation result. Agent validation is performed during
+   * training time and is updated automatically when training is completed.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent is associated with.
+   *   Format: `projects/<Project ID>`.
+   * @param {string} [request.languageCode]
+   *   Optional. The language for which you want a validation result. If not
+   *   specified, the agent's default language is used. [Many
+   *   languages](https://cloud.google.com/dialogflow/docs/reference/language)
+   *   are supported. Note: languages must be enabled in the agent before they can
+   *   be used.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [ValidationResult]{@link google.cloud.dialogflow.v2.ValidationResult}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/agents.get_validation_result.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_GetValidationResult_async
+   */
   getValidationResult(
     request?: protos.google.cloud.dialogflow.v2.IGetValidationResultRequest,
     options?: CallOptions
@@ -798,31 +823,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Gets agent validation result. Agent validation is performed during
-   * training time and is updated automatically when training is completed.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent is associated with.
-   *   Format: `projects/<Project ID>`.
-   * @param {string} [request.languageCode]
-   *   Optional. The language for which you want a validation result. If not
-   *   specified, the agent's default language is used. [Many
-   *   languages](https://cloud.google.com/dialogflow/docs/reference/language)
-   *   are supported. Note: languages must be enabled in the agent before they can
-   *   be used.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [ValidationResult]{@link google.cloud.dialogflow.v2.ValidationResult}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getValidationResult(request);
-   */
   getValidationResult(
     request?: protos.google.cloud.dialogflow.v2.IGetValidationResultRequest,
     optionsOrCallback?:
@@ -867,6 +867,39 @@ export class AgentsClient {
     return this.innerApiCalls.getValidationResult(request, options, callback);
   }
 
+  /**
+   * Trains the specified agent.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: An empty [Struct
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
+   * - `response`: An [Empty
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent to train is associated with.
+   *   Format: `projects/<Project ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/agents.train_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_TrainAgent_async
+   */
   trainAgent(
     request?: protos.google.cloud.dialogflow.v2.ITrainAgentRequest,
     options?: CallOptions
@@ -903,40 +936,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Trains the specified agent.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: An empty [Struct
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
-   * - `response`: An [Empty
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent to train is associated with.
-   *   Format: `projects/<Project ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.trainAgent(request);
-   * const [response] = await operation.promise();
-   */
   trainAgent(
     request?: protos.google.cloud.dialogflow.v2.ITrainAgentRequest,
     optionsOrCallback?:
@@ -994,11 +993,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkTrainAgentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/agents.train_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_TrainAgent_async
    */
   async checkTrainAgentProgress(
     name: string
@@ -1019,6 +1015,39 @@ export class AgentsClient {
       protos.google.protobuf.Struct
     >;
   }
+  /**
+   * Exports the specified agent to a ZIP file.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: An empty [Struct
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
+   * - `response`: {@link google.cloud.dialogflow.v2.ExportAgentResponse|ExportAgentResponse}
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent to export is associated with.
+   *   Format: `projects/<Project ID>`.
+   * @param {string} request.agentUri
+   *   Required. The [Google Cloud Storage](https://cloud.google.com/storage/docs/)
+   *   URI to export the agent to.
+   *   The format of this URI must be `gs://<bucket-name>/<object-name>`.
+   *   If left unspecified, the serialized agent is returned inline.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/agents.export_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_ExportAgent_async
+   */
   exportAgent(
     request?: protos.google.cloud.dialogflow.v2.IExportAgentRequest,
     options?: CallOptions
@@ -1055,40 +1084,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Exports the specified agent to a ZIP file.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: An empty [Struct
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
-   * - `response`: {@link google.cloud.dialogflow.v2.ExportAgentResponse|ExportAgentResponse}
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent to export is associated with.
-   *   Format: `projects/<Project ID>`.
-   * @param {string} request.agentUri
-   *   Required. The [Google Cloud Storage](https://cloud.google.com/storage/docs/)
-   *   URI to export the agent to.
-   *   The format of this URI must be `gs://<bucket-name>/<object-name>`.
-   *   If left unspecified, the serialized agent is returned inline.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.exportAgent(request);
-   * const [response] = await operation.promise();
-   */
   exportAgent(
     request?: protos.google.cloud.dialogflow.v2.IExportAgentRequest,
     optionsOrCallback?:
@@ -1146,11 +1141,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkExportAgentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/agents.export_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_ExportAgent_async
    */
   async checkExportAgentProgress(
     name: string
@@ -1174,42 +1166,6 @@ export class AgentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  importAgent(
-    request?: protos.google.cloud.dialogflow.v2.IImportAgentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  importAgent(
-    request: protos.google.cloud.dialogflow.v2.IImportAgentRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  importAgent(
-    request: protos.google.cloud.dialogflow.v2.IImportAgentRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Imports the specified agent from a ZIP file.
    *
@@ -1256,10 +1212,45 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.importAgent(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2/agents.import_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_ImportAgent_async
    */
+  importAgent(
+    request?: protos.google.cloud.dialogflow.v2.IImportAgentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  importAgent(
+    request: protos.google.cloud.dialogflow.v2.IImportAgentRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  importAgent(
+    request: protos.google.cloud.dialogflow.v2.IImportAgentRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   importAgent(
     request?: protos.google.cloud.dialogflow.v2.IImportAgentRequest,
     optionsOrCallback?:
@@ -1317,11 +1308,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkImportAgentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/agents.import_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_ImportAgent_async
    */
   async checkImportAgentProgress(
     name: string
@@ -1342,42 +1330,6 @@ export class AgentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  restoreAgent(
-    request?: protos.google.cloud.dialogflow.v2.IRestoreAgentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  restoreAgent(
-    request: protos.google.cloud.dialogflow.v2.IRestoreAgentRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  restoreAgent(
-    request: protos.google.cloud.dialogflow.v2.IRestoreAgentRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Restores the specified agent from a ZIP file.
    *
@@ -1423,10 +1375,45 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.restoreAgent(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2/agents.restore_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_RestoreAgent_async
    */
+  restoreAgent(
+    request?: protos.google.cloud.dialogflow.v2.IRestoreAgentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  restoreAgent(
+    request: protos.google.cloud.dialogflow.v2.IRestoreAgentRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  restoreAgent(
+    request: protos.google.cloud.dialogflow.v2.IRestoreAgentRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   restoreAgent(
     request?: protos.google.cloud.dialogflow.v2.IRestoreAgentRequest,
     optionsOrCallback?:
@@ -1484,11 +1471,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkRestoreAgentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/agents.restore_agent.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_RestoreAgent_async
    */
   async checkRestoreAgentProgress(
     name: string
@@ -1509,37 +1493,6 @@ export class AgentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  searchAgents(
-    request?: protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IAgent[],
-      protos.google.cloud.dialogflow.v2.ISearchAgentsRequest | null,
-      protos.google.cloud.dialogflow.v2.ISearchAgentsResponse
-    ]
-  >;
-  searchAgents(
-    request: protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
-      | protos.google.cloud.dialogflow.v2.ISearchAgentsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IAgent
-    >
-  ): void;
-  searchAgents(
-    request: protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
-      | protos.google.cloud.dialogflow.v2.ISearchAgentsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IAgent
-    >
-  ): void;
   /**
    * Returns the list of agents.
    *
@@ -1572,6 +1525,37 @@ export class AgentsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  searchAgents(
+    request?: protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IAgent[],
+      protos.google.cloud.dialogflow.v2.ISearchAgentsRequest | null,
+      protos.google.cloud.dialogflow.v2.ISearchAgentsResponse
+    ]
+  >;
+  searchAgents(
+    request: protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
+      | protos.google.cloud.dialogflow.v2.ISearchAgentsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IAgent
+    >
+  ): void;
+  searchAgents(
+    request: protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
+      | protos.google.cloud.dialogflow.v2.ISearchAgentsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IAgent
+    >
+  ): void;
   searchAgents(
     request?: protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
     optionsOrCallback?:
@@ -1686,11 +1670,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.searchAgentsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/agents.search_agents.js</caption>
+   * region_tag:dialogflow_v2_generated_Agents_SearchAgents_async
    */
   searchAgentsAsync(
     request?: protos.google.cloud.dialogflow.v2.ISearchAgentsRequest,
@@ -1704,7 +1685,6 @@ export class AgentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['searchAgents'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/answer_records_client.ts b/packages/google-cloud-dialogflow/src/v2/answer_records_client.ts
index b276d23850b..38376de1360 100644
--- a/packages/google-cloud-dialogflow/src/v2/answer_records_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/answer_records_client.ts
@@ -436,6 +436,25 @@ export class AnswerRecordsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Updates the specified answer record.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.AnswerRecord} request.answerRecord
+   *   Required. Answer record to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [AnswerRecord]{@link google.cloud.dialogflow.v2.AnswerRecord}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/answer_records.update_answer_record.js</caption>
+   * region_tag:dialogflow_v2_generated_AnswerRecords_UpdateAnswerRecord_async
+   */
   updateAnswerRecord(
     request?: protos.google.cloud.dialogflow.v2.IUpdateAnswerRecordRequest,
     options?: CallOptions
@@ -467,25 +486,6 @@ export class AnswerRecordsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified answer record.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.AnswerRecord} request.answerRecord
-   *   Required. Answer record to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [AnswerRecord]{@link google.cloud.dialogflow.v2.AnswerRecord}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateAnswerRecord(request);
-   */
   updateAnswerRecord(
     request?: protos.google.cloud.dialogflow.v2.IUpdateAnswerRecordRequest,
     optionsOrCallback?:
@@ -530,37 +530,6 @@ export class AnswerRecordsClient {
     return this.innerApiCalls.updateAnswerRecord(request, options, callback);
   }
 
-  listAnswerRecords(
-    request?: protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IAnswerRecord[],
-      protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest | null,
-      protos.google.cloud.dialogflow.v2.IListAnswerRecordsResponse
-    ]
-  >;
-  listAnswerRecords(
-    request: protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
-      | protos.google.cloud.dialogflow.v2.IListAnswerRecordsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IAnswerRecord
-    >
-  ): void;
-  listAnswerRecords(
-    request: protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
-      | protos.google.cloud.dialogflow.v2.IListAnswerRecordsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IAnswerRecord
-    >
-  ): void;
   /**
    * Returns the list of all answer records in the specified project in reverse
    * chronological order.
@@ -600,6 +569,37 @@ export class AnswerRecordsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listAnswerRecords(
+    request?: protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IAnswerRecord[],
+      protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest | null,
+      protos.google.cloud.dialogflow.v2.IListAnswerRecordsResponse
+    ]
+  >;
+  listAnswerRecords(
+    request: protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
+      | protos.google.cloud.dialogflow.v2.IListAnswerRecordsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IAnswerRecord
+    >
+  ): void;
+  listAnswerRecords(
+    request: protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
+      | protos.google.cloud.dialogflow.v2.IListAnswerRecordsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IAnswerRecord
+    >
+  ): void;
   listAnswerRecords(
     request?: protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
     optionsOrCallback?:
@@ -738,11 +738,8 @@ export class AnswerRecordsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listAnswerRecordsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/answer_records.list_answer_records.js</caption>
+   * region_tag:dialogflow_v2_generated_AnswerRecords_ListAnswerRecords_async
    */
   listAnswerRecordsAsync(
     request?: protos.google.cloud.dialogflow.v2.IListAnswerRecordsRequest,
@@ -756,7 +753,6 @@ export class AnswerRecordsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listAnswerRecords'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/contexts_client.ts b/packages/google-cloud-dialogflow/src/v2/contexts_client.ts
index 9380b8b5d61..f6852be51df 100644
--- a/packages/google-cloud-dialogflow/src/v2/contexts_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/contexts_client.ts
@@ -443,6 +443,28 @@ export class ContextsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified context.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the context. Format:
+   *   `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context ID>`
+   *   or `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *   ID>/sessions/<Session ID>/contexts/<Context ID>`.
+   *   If `Environment ID` is not specified, we assume default 'draft'
+   *   environment. If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2.Context}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/contexts.get_context.js</caption>
+   * region_tag:dialogflow_v2_generated_Contexts_GetContext_async
+   */
   getContext(
     request?: protos.google.cloud.dialogflow.v2.IGetContextRequest,
     options?: CallOptions
@@ -470,28 +492,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified context.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the context. Format:
-   *   `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context ID>`
-   *   or `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *   ID>/sessions/<Session ID>/contexts/<Context ID>`.
-   *   If `Environment ID` is not specified, we assume default 'draft'
-   *   environment. If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2.Context}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getContext(request);
-   */
   getContext(
     request?: protos.google.cloud.dialogflow.v2.IGetContextRequest,
     optionsOrCallback?:
@@ -533,6 +533,32 @@ export class ContextsClient {
     this.initialize();
     return this.innerApiCalls.getContext(request, options, callback);
   }
+  /**
+   * Creates a context.
+   *
+   * If the specified context already exists, overrides the context.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The session to create a context for.
+   *   Format: `projects/<Project ID>/agent/sessions/<Session ID>` or
+   *   `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *   ID>/sessions/<Session ID>`.
+   *   If `Environment ID` is not specified, we assume default 'draft'
+   *   environment. If `User ID` is not specified, we assume default '-' user.
+   * @param {google.cloud.dialogflow.v2.Context} request.context
+   *   Required. The context to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2.Context}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/contexts.create_context.js</caption>
+   * region_tag:dialogflow_v2_generated_Contexts_CreateContext_async
+   */
   createContext(
     request?: protos.google.cloud.dialogflow.v2.ICreateContextRequest,
     options?: CallOptions
@@ -564,32 +590,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a context.
-   *
-   * If the specified context already exists, overrides the context.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The session to create a context for.
-   *   Format: `projects/<Project ID>/agent/sessions/<Session ID>` or
-   *   `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *   ID>/sessions/<Session ID>`.
-   *   If `Environment ID` is not specified, we assume default 'draft'
-   *   environment. If `User ID` is not specified, we assume default '-' user.
-   * @param {google.cloud.dialogflow.v2.Context} request.context
-   *   Required. The context to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2.Context}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createContext(request);
-   */
   createContext(
     request?: protos.google.cloud.dialogflow.v2.ICreateContextRequest,
     optionsOrCallback?:
@@ -633,6 +633,25 @@ export class ContextsClient {
     this.initialize();
     return this.innerApiCalls.createContext(request, options, callback);
   }
+  /**
+   * Updates the specified context.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.Context} request.context
+   *   Required. The context to update.
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2.Context}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/contexts.update_context.js</caption>
+   * region_tag:dialogflow_v2_generated_Contexts_UpdateContext_async
+   */
   updateContext(
     request?: protos.google.cloud.dialogflow.v2.IUpdateContextRequest,
     options?: CallOptions
@@ -664,25 +683,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified context.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.Context} request.context
-   *   Required. The context to update.
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2.Context}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateContext(request);
-   */
   updateContext(
     request?: protos.google.cloud.dialogflow.v2.IUpdateContextRequest,
     optionsOrCallback?:
@@ -726,6 +726,28 @@ export class ContextsClient {
     this.initialize();
     return this.innerApiCalls.updateContext(request, options, callback);
   }
+  /**
+   * Deletes the specified context.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the context to delete. Format:
+   *   `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context ID>`
+   *   or `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *   ID>/sessions/<Session ID>/contexts/<Context ID>`.
+   *   If `Environment ID` is not specified, we assume default 'draft'
+   *   environment. If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/contexts.delete_context.js</caption>
+   * region_tag:dialogflow_v2_generated_Contexts_DeleteContext_async
+   */
   deleteContext(
     request?: protos.google.cloud.dialogflow.v2.IDeleteContextRequest,
     options?: CallOptions
@@ -757,28 +779,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified context.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the context to delete. Format:
-   *   `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context ID>`
-   *   or `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *   ID>/sessions/<Session ID>/contexts/<Context ID>`.
-   *   If `Environment ID` is not specified, we assume default 'draft'
-   *   environment. If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteContext(request);
-   */
   deleteContext(
     request?: protos.google.cloud.dialogflow.v2.IDeleteContextRequest,
     optionsOrCallback?:
@@ -822,6 +822,28 @@ export class ContextsClient {
     this.initialize();
     return this.innerApiCalls.deleteContext(request, options, callback);
   }
+  /**
+   * Deletes all active contexts in the specified session.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the session to delete all contexts from. Format:
+   *   `projects/<Project ID>/agent/sessions/<Session ID>` or `projects/<Project
+   *   ID>/agent/environments/<Environment ID>/users/<User ID>/sessions/<Session
+   *   ID>`.
+   *   If `Environment ID` is not specified we assume default 'draft' environment.
+   *   If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/contexts.delete_all_contexts.js</caption>
+   * region_tag:dialogflow_v2_generated_Contexts_DeleteAllContexts_async
+   */
   deleteAllContexts(
     request?: protos.google.cloud.dialogflow.v2.IDeleteAllContextsRequest,
     options?: CallOptions
@@ -853,28 +875,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes all active contexts in the specified session.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the session to delete all contexts from. Format:
-   *   `projects/<Project ID>/agent/sessions/<Session ID>` or `projects/<Project
-   *   ID>/agent/environments/<Environment ID>/users/<User ID>/sessions/<Session
-   *   ID>`.
-   *   If `Environment ID` is not specified we assume default 'draft' environment.
-   *   If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteAllContexts(request);
-   */
   deleteAllContexts(
     request?: protos.google.cloud.dialogflow.v2.IDeleteAllContextsRequest,
     optionsOrCallback?:
@@ -919,6 +919,36 @@ export class ContextsClient {
     return this.innerApiCalls.deleteAllContexts(request, options, callback);
   }
 
+  /**
+   * Returns the list of all contexts in the specified session.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The session to list all contexts from.
+   *   Format: `projects/<Project ID>/agent/sessions/<Session ID>` or
+   *   `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *   ID>/sessions/<Session ID>`.
+   *   If `Environment ID` is not specified, we assume default 'draft'
+   *   environment. If `User ID` is not specified, we assume default '-' user.
+   * @param {number} [request.pageSize]
+   *   Optional. The maximum number of items to return in a single page. By
+   *   default 100 and at most 1000.
+   * @param {string} [request.pageToken]
+   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Context]{@link google.cloud.dialogflow.v2.Context}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listContextsAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listContexts(
     request?: protos.google.cloud.dialogflow.v2.IListContextsRequest,
     options?: CallOptions
@@ -950,36 +980,6 @@ export class ContextsClient {
       protos.google.cloud.dialogflow.v2.IContext
     >
   ): void;
-  /**
-   * Returns the list of all contexts in the specified session.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The session to list all contexts from.
-   *   Format: `projects/<Project ID>/agent/sessions/<Session ID>` or
-   *   `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *   ID>/sessions/<Session ID>`.
-   *   If `Environment ID` is not specified, we assume default 'draft'
-   *   environment. If `User ID` is not specified, we assume default '-' user.
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By
-   *   default 100 and at most 1000.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Context]{@link google.cloud.dialogflow.v2.Context}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listContextsAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listContexts(
     request?: protos.google.cloud.dialogflow.v2.IListContextsRequest,
     optionsOrCallback?:
@@ -1102,11 +1102,8 @@ export class ContextsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listContextsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/contexts.list_contexts.js</caption>
+   * region_tag:dialogflow_v2_generated_Contexts_ListContexts_async
    */
   listContextsAsync(
     request?: protos.google.cloud.dialogflow.v2.IListContextsRequest,
@@ -1120,7 +1117,6 @@ export class ContextsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listContexts'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/conversation_profiles_client.ts b/packages/google-cloud-dialogflow/src/v2/conversation_profiles_client.ts
index 9d609cbe042..326613b80ef 100644
--- a/packages/google-cloud-dialogflow/src/v2/conversation_profiles_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/conversation_profiles_client.ts
@@ -442,6 +442,25 @@ export class ConversationProfilesClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified conversation profile.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The resource name of the conversation profile.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversationProfiles/<Conversation Profile ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2.ConversationProfile}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/conversation_profiles.get_conversation_profile.js</caption>
+   * region_tag:dialogflow_v2_generated_ConversationProfiles_GetConversationProfile_async
+   */
   getConversationProfile(
     request?: protos.google.cloud.dialogflow.v2.IGetConversationProfileRequest,
     options?: CallOptions
@@ -476,25 +495,6 @@ export class ConversationProfilesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified conversation profile.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The resource name of the conversation profile.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversationProfiles/<Conversation Profile ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2.ConversationProfile}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getConversationProfile(request);
-   */
   getConversationProfile(
     request?: protos.google.cloud.dialogflow.v2.IGetConversationProfileRequest,
     optionsOrCallback?:
@@ -545,6 +545,30 @@ export class ConversationProfilesClient {
       callback
     );
   }
+  /**
+   * Creates a conversation profile in the specified project.
+   *
+   * {@link |ConversationProfile.CreateTime} and {@link |ConversationProfile.UpdateTime}
+   * aren't populated in the response. You can retrieve them via
+   * {@link google.cloud.dialogflow.v2.ConversationProfiles.GetConversationProfile|GetConversationProfile} API.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project to create a conversation profile for.
+   *   Format: `projects/<Project ID>/locations/<Location ID>`.
+   * @param {google.cloud.dialogflow.v2.ConversationProfile} request.conversationProfile
+   *   Required. The conversation profile to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2.ConversationProfile}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/conversation_profiles.create_conversation_profile.js</caption>
+   * region_tag:dialogflow_v2_generated_ConversationProfiles_CreateConversationProfile_async
+   */
   createConversationProfile(
     request?: protos.google.cloud.dialogflow.v2.ICreateConversationProfileRequest,
     options?: CallOptions
@@ -579,30 +603,6 @@ export class ConversationProfilesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a conversation profile in the specified project.
-   *
-   * {@link |ConversationProfile.CreateTime} and {@link |ConversationProfile.UpdateTime}
-   * aren't populated in the response. You can retrieve them via
-   * {@link google.cloud.dialogflow.v2.ConversationProfiles.GetConversationProfile|GetConversationProfile} API.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project to create a conversation profile for.
-   *   Format: `projects/<Project ID>/locations/<Location ID>`.
-   * @param {google.cloud.dialogflow.v2.ConversationProfile} request.conversationProfile
-   *   Required. The conversation profile to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2.ConversationProfile}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createConversationProfile(request);
-   */
   createConversationProfile(
     request?: protos.google.cloud.dialogflow.v2.ICreateConversationProfileRequest,
     optionsOrCallback?:
@@ -653,6 +653,29 @@ export class ConversationProfilesClient {
       callback
     );
   }
+  /**
+   * Updates the specified conversation profile.
+   *
+   * {@link |ConversationProfile.CreateTime} and {@link |ConversationProfile.UpdateTime}
+   * aren't populated in the response. You can retrieve them via
+   * {@link google.cloud.dialogflow.v2.ConversationProfiles.GetConversationProfile|GetConversationProfile} API.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.ConversationProfile} request.conversationProfile
+   *   Required. The conversation profile to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields to update.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2.ConversationProfile}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/conversation_profiles.update_conversation_profile.js</caption>
+   * region_tag:dialogflow_v2_generated_ConversationProfiles_UpdateConversationProfile_async
+   */
   updateConversationProfile(
     request?: protos.google.cloud.dialogflow.v2.IUpdateConversationProfileRequest,
     options?: CallOptions
@@ -687,29 +710,6 @@ export class ConversationProfilesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified conversation profile.
-   *
-   * {@link |ConversationProfile.CreateTime} and {@link |ConversationProfile.UpdateTime}
-   * aren't populated in the response. You can retrieve them via
-   * {@link google.cloud.dialogflow.v2.ConversationProfiles.GetConversationProfile|GetConversationProfile} API.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.ConversationProfile} request.conversationProfile
-   *   Required. The conversation profile to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields to update.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2.ConversationProfile}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateConversationProfile(request);
-   */
   updateConversationProfile(
     request?: protos.google.cloud.dialogflow.v2.IUpdateConversationProfileRequest,
     optionsOrCallback?:
@@ -760,6 +760,25 @@ export class ConversationProfilesClient {
       callback
     );
   }
+  /**
+   * Deletes the specified conversation profile.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the conversation profile to delete.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversationProfiles/<Conversation Profile ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/conversation_profiles.delete_conversation_profile.js</caption>
+   * region_tag:dialogflow_v2_generated_ConversationProfiles_DeleteConversationProfile_async
+   */
   deleteConversationProfile(
     request?: protos.google.cloud.dialogflow.v2.IDeleteConversationProfileRequest,
     options?: CallOptions
@@ -794,25 +813,6 @@ export class ConversationProfilesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified conversation profile.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the conversation profile to delete.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversationProfiles/<Conversation Profile ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteConversationProfile(request);
-   */
   deleteConversationProfile(
     request?: protos.google.cloud.dialogflow.v2.IDeleteConversationProfileRequest,
     optionsOrCallback?:
@@ -864,6 +864,32 @@ export class ConversationProfilesClient {
     );
   }
 
+  /**
+   * Returns the list of all conversation profiles in the specified project.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project to list all conversation profiles from.
+   *   Format: `projects/<Project ID>/locations/<Location ID>`.
+   * @param {number} request.pageSize
+   *   The maximum number of items to return in a single page. By
+   *   default 100 and at most 1000.
+   * @param {string} request.pageToken
+   *   The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [ConversationProfile]{@link google.cloud.dialogflow.v2.ConversationProfile}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listConversationProfilesAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listConversationProfiles(
     request?: protos.google.cloud.dialogflow.v2.IListConversationProfilesRequest,
     options?: CallOptions
@@ -895,32 +921,6 @@ export class ConversationProfilesClient {
       protos.google.cloud.dialogflow.v2.IConversationProfile
     >
   ): void;
-  /**
-   * Returns the list of all conversation profiles in the specified project.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project to list all conversation profiles from.
-   *   Format: `projects/<Project ID>/locations/<Location ID>`.
-   * @param {number} request.pageSize
-   *   The maximum number of items to return in a single page. By
-   *   default 100 and at most 1000.
-   * @param {string} request.pageToken
-   *   The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [ConversationProfile]{@link google.cloud.dialogflow.v2.ConversationProfile}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listConversationProfilesAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listConversationProfiles(
     request?: protos.google.cloud.dialogflow.v2.IListConversationProfilesRequest,
     optionsOrCallback?:
@@ -1039,11 +1039,8 @@ export class ConversationProfilesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listConversationProfilesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/conversation_profiles.list_conversation_profiles.js</caption>
+   * region_tag:dialogflow_v2_generated_ConversationProfiles_ListConversationProfiles_async
    */
   listConversationProfilesAsync(
     request?: protos.google.cloud.dialogflow.v2.IListConversationProfilesRequest,
@@ -1057,7 +1054,6 @@ export class ConversationProfilesClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listConversationProfiles'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/conversations_client.ts b/packages/google-cloud-dialogflow/src/v2/conversations_client.ts
index 5b42c52c409..dc68f4e6f0d 100644
--- a/packages/google-cloud-dialogflow/src/v2/conversations_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/conversations_client.ts
@@ -444,37 +444,6 @@ export class ConversationsClient {
   // -------------------
   // -- Service calls --
   // -------------------
-  createConversation(
-    request?: protos.google.cloud.dialogflow.v2.ICreateConversationRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IConversation,
-      protos.google.cloud.dialogflow.v2.ICreateConversationRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  createConversation(
-    request: protos.google.cloud.dialogflow.v2.ICreateConversationRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IConversation,
-      | protos.google.cloud.dialogflow.v2.ICreateConversationRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  createConversation(
-    request: protos.google.cloud.dialogflow.v2.ICreateConversationRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IConversation,
-      | protos.google.cloud.dialogflow.v2.ICreateConversationRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Creates a new conversation. Conversations are auto-completed after 24
    * hours.
@@ -520,9 +489,40 @@ export class ConversationsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.createConversation(request);
+   * @example <caption>include:samples/generated/v2/conversations.create_conversation.js</caption>
+   * region_tag:dialogflow_v2_generated_Conversations_CreateConversation_async
    */
+  createConversation(
+    request?: protos.google.cloud.dialogflow.v2.ICreateConversationRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IConversation,
+      protos.google.cloud.dialogflow.v2.ICreateConversationRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  createConversation(
+    request: protos.google.cloud.dialogflow.v2.ICreateConversationRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IConversation,
+      | protos.google.cloud.dialogflow.v2.ICreateConversationRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  createConversation(
+    request: protos.google.cloud.dialogflow.v2.ICreateConversationRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IConversation,
+      | protos.google.cloud.dialogflow.v2.ICreateConversationRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   createConversation(
     request?: protos.google.cloud.dialogflow.v2.ICreateConversationRequest,
     optionsOrCallback?:
@@ -566,6 +566,25 @@ export class ConversationsClient {
     this.initialize();
     return this.innerApiCalls.createConversation(request, options, callback);
   }
+  /**
+   * Retrieves the specific conversation.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the conversation. Format:
+   *   `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
+   *   ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Conversation]{@link google.cloud.dialogflow.v2.Conversation}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/conversations.get_conversation.js</caption>
+   * region_tag:dialogflow_v2_generated_Conversations_GetConversation_async
+   */
   getConversation(
     request?: protos.google.cloud.dialogflow.v2.IGetConversationRequest,
     options?: CallOptions
@@ -597,25 +616,6 @@ export class ConversationsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specific conversation.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the conversation. Format:
-   *   `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
-   *   ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Conversation]{@link google.cloud.dialogflow.v2.Conversation}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getConversation(request);
-   */
   getConversation(
     request?: protos.google.cloud.dialogflow.v2.IGetConversationRequest,
     optionsOrCallback?:
@@ -659,6 +659,26 @@ export class ConversationsClient {
     this.initialize();
     return this.innerApiCalls.getConversation(request, options, callback);
   }
+  /**
+   * Completes the specified conversation. Finished conversations are purged
+   * from the database after 30 days.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. Resource identifier of the conversation to close.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Conversation]{@link google.cloud.dialogflow.v2.Conversation}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/conversations.complete_conversation.js</caption>
+   * region_tag:dialogflow_v2_generated_Conversations_CompleteConversation_async
+   */
   completeConversation(
     request?: protos.google.cloud.dialogflow.v2.ICompleteConversationRequest,
     options?: CallOptions
@@ -693,26 +713,6 @@ export class ConversationsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Completes the specified conversation. Finished conversations are purged
-   * from the database after 30 days.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. Resource identifier of the conversation to close.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Conversation]{@link google.cloud.dialogflow.v2.Conversation}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.completeConversation(request);
-   */
   completeConversation(
     request?: protos.google.cloud.dialogflow.v2.ICompleteConversationRequest,
     optionsOrCallback?:
@@ -760,37 +760,6 @@ export class ConversationsClient {
     return this.innerApiCalls.completeConversation(request, options, callback);
   }
 
-  listConversations(
-    request?: protos.google.cloud.dialogflow.v2.IListConversationsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IConversation[],
-      protos.google.cloud.dialogflow.v2.IListConversationsRequest | null,
-      protos.google.cloud.dialogflow.v2.IListConversationsResponse
-    ]
-  >;
-  listConversations(
-    request: protos.google.cloud.dialogflow.v2.IListConversationsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListConversationsRequest,
-      | protos.google.cloud.dialogflow.v2.IListConversationsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IConversation
-    >
-  ): void;
-  listConversations(
-    request: protos.google.cloud.dialogflow.v2.IListConversationsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListConversationsRequest,
-      | protos.google.cloud.dialogflow.v2.IListConversationsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IConversation
-    >
-  ): void;
   /**
    * Returns the list of all conversations in the specified project.
    *
@@ -835,6 +804,37 @@ export class ConversationsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listConversations(
+    request?: protos.google.cloud.dialogflow.v2.IListConversationsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IConversation[],
+      protos.google.cloud.dialogflow.v2.IListConversationsRequest | null,
+      protos.google.cloud.dialogflow.v2.IListConversationsResponse
+    ]
+  >;
+  listConversations(
+    request: protos.google.cloud.dialogflow.v2.IListConversationsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListConversationsRequest,
+      | protos.google.cloud.dialogflow.v2.IListConversationsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IConversation
+    >
+  ): void;
+  listConversations(
+    request: protos.google.cloud.dialogflow.v2.IListConversationsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListConversationsRequest,
+      | protos.google.cloud.dialogflow.v2.IListConversationsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IConversation
+    >
+  ): void;
   listConversations(
     request?: protos.google.cloud.dialogflow.v2.IListConversationsRequest,
     optionsOrCallback?:
@@ -985,11 +985,8 @@ export class ConversationsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listConversationsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/conversations.list_conversations.js</caption>
+   * region_tag:dialogflow_v2_generated_Conversations_ListConversations_async
    */
   listConversationsAsync(
     request?: protos.google.cloud.dialogflow.v2.IListConversationsRequest,
@@ -1003,7 +1000,6 @@ export class ConversationsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listConversations'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
@@ -1013,37 +1009,6 @@ export class ConversationsClient {
       callSettings
     ) as AsyncIterable<protos.google.cloud.dialogflow.v2.IConversation>;
   }
-  listMessages(
-    request?: protos.google.cloud.dialogflow.v2.IListMessagesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IMessage[],
-      protos.google.cloud.dialogflow.v2.IListMessagesRequest | null,
-      protos.google.cloud.dialogflow.v2.IListMessagesResponse
-    ]
-  >;
-  listMessages(
-    request: protos.google.cloud.dialogflow.v2.IListMessagesRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListMessagesRequest,
-      | protos.google.cloud.dialogflow.v2.IListMessagesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IMessage
-    >
-  ): void;
-  listMessages(
-    request: protos.google.cloud.dialogflow.v2.IListMessagesRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListMessagesRequest,
-      | protos.google.cloud.dialogflow.v2.IListMessagesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IMessage
-    >
-  ): void;
   /**
    * Lists messages that belong to a given conversation.
    * `messages` are ordered by `create_time` in descending order. To fetch
@@ -1084,6 +1049,37 @@ export class ConversationsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listMessages(
+    request?: protos.google.cloud.dialogflow.v2.IListMessagesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IMessage[],
+      protos.google.cloud.dialogflow.v2.IListMessagesRequest | null,
+      protos.google.cloud.dialogflow.v2.IListMessagesResponse
+    ]
+  >;
+  listMessages(
+    request: protos.google.cloud.dialogflow.v2.IListMessagesRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListMessagesRequest,
+      | protos.google.cloud.dialogflow.v2.IListMessagesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IMessage
+    >
+  ): void;
+  listMessages(
+    request: protos.google.cloud.dialogflow.v2.IListMessagesRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListMessagesRequest,
+      | protos.google.cloud.dialogflow.v2.IListMessagesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IMessage
+    >
+  ): void;
   listMessages(
     request?: protos.google.cloud.dialogflow.v2.IListMessagesRequest,
     optionsOrCallback?:
@@ -1218,11 +1214,8 @@ export class ConversationsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listMessagesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/conversations.list_messages.js</caption>
+   * region_tag:dialogflow_v2_generated_Conversations_ListMessages_async
    */
   listMessagesAsync(
     request?: protos.google.cloud.dialogflow.v2.IListMessagesRequest,
@@ -1236,7 +1229,6 @@ export class ConversationsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listMessages'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/documents_client.ts b/packages/google-cloud-dialogflow/src/v2/documents_client.ts
index 8f7b6b83f62..5a3787d9467 100644
--- a/packages/google-cloud-dialogflow/src/v2/documents_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/documents_client.ts
@@ -505,6 +505,25 @@ export class DocumentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified document.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the document to retrieve.
+   *   Format `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Document]{@link google.cloud.dialogflow.v2.Document}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/documents.get_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_GetDocument_async
+   */
   getDocument(
     request?: protos.google.cloud.dialogflow.v2.IGetDocumentRequest,
     options?: CallOptions
@@ -532,25 +551,6 @@ export class DocumentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified document.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the document to retrieve.
-   *   Format `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Document]{@link google.cloud.dialogflow.v2.Document}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getDocument(request);
-   */
   getDocument(
     request?: protos.google.cloud.dialogflow.v2.IGetDocumentRequest,
     optionsOrCallback?:
@@ -593,6 +593,36 @@ export class DocumentsClient {
     return this.innerApiCalls.getDocument(request, options, callback);
   }
 
+  /**
+   * Creates a new document.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: {@link google.cloud.dialogflow.v2.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
+   * - `response`: {@link google.cloud.dialogflow.v2.Document|Document}
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The knowledge base to create a document for.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>`.
+   * @param {google.cloud.dialogflow.v2.Document} request.document
+   *   Required. The document to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/documents.create_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_CreateDocument_async
+   */
   createDocument(
     request?: protos.google.cloud.dialogflow.v2.ICreateDocumentRequest,
     options?: CallOptions
@@ -629,37 +659,6 @@ export class DocumentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a new document.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: {@link google.cloud.dialogflow.v2.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
-   * - `response`: {@link google.cloud.dialogflow.v2.Document|Document}
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The knowledge base to create a document for.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>`.
-   * @param {google.cloud.dialogflow.v2.Document} request.document
-   *   Required. The document to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.createDocument(request);
-   * const [response] = await operation.promise();
-   */
   createDocument(
     request?: protos.google.cloud.dialogflow.v2.ICreateDocumentRequest,
     optionsOrCallback?:
@@ -717,11 +716,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkCreateDocumentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/documents.create_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_CreateDocument_async
    */
   async checkCreateDocumentProgress(
     name: string
@@ -745,6 +741,35 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2.KnowledgeOperationMetadata
     >;
   }
+  /**
+   * Deletes the specified document.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: {@link google.cloud.dialogflow.v2.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
+   * - `response`: An [Empty
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the document to delete.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/documents.delete_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_DeleteDocument_async
+   */
   deleteDocument(
     request?: protos.google.cloud.dialogflow.v2.IDeleteDocumentRequest,
     options?: CallOptions
@@ -781,36 +806,6 @@ export class DocumentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified document.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: {@link google.cloud.dialogflow.v2.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
-   * - `response`: An [Empty
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the document to delete.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.deleteDocument(request);
-   * const [response] = await operation.promise();
-   */
   deleteDocument(
     request?: protos.google.cloud.dialogflow.v2.IDeleteDocumentRequest,
     optionsOrCallback?:
@@ -868,11 +863,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkDeleteDocumentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/documents.delete_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_DeleteDocument_async
    */
   async checkDeleteDocumentProgress(
     name: string
@@ -896,6 +888,36 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2.KnowledgeOperationMetadata
     >;
   }
+  /**
+   * Updates the specified document.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: {@link google.cloud.dialogflow.v2.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
+   * - `response`: {@link google.cloud.dialogflow.v2.Document|Document}
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.Document} request.document
+   *   Required. The document to update.
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. Not specified means `update all`.
+   *   Currently, only `display_name` can be updated, an InvalidArgument will be
+   *   returned for attempting to update other fields.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/documents.update_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_UpdateDocument_async
+   */
   updateDocument(
     request?: protos.google.cloud.dialogflow.v2.IUpdateDocumentRequest,
     options?: CallOptions
@@ -932,37 +954,6 @@ export class DocumentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified document.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: {@link google.cloud.dialogflow.v2.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
-   * - `response`: {@link google.cloud.dialogflow.v2.Document|Document}
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.Document} request.document
-   *   Required. The document to update.
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. Not specified means `update all`.
-   *   Currently, only `display_name` can be updated, an InvalidArgument will be
-   *   returned for attempting to update other fields.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.updateDocument(request);
-   * const [response] = await operation.promise();
-   */
   updateDocument(
     request?: protos.google.cloud.dialogflow.v2.IUpdateDocumentRequest,
     optionsOrCallback?:
@@ -1020,11 +1011,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkUpdateDocumentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/documents.update_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_UpdateDocument_async
    */
   async checkUpdateDocumentProgress(
     name: string
@@ -1048,42 +1036,6 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2.KnowledgeOperationMetadata
     >;
   }
-  reloadDocument(
-    request?: protos.google.cloud.dialogflow.v2.IReloadDocumentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IDocument,
-        protos.google.cloud.dialogflow.v2.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  reloadDocument(
-    request: protos.google.cloud.dialogflow.v2.IReloadDocumentRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IDocument,
-        protos.google.cloud.dialogflow.v2.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  reloadDocument(
-    request: protos.google.cloud.dialogflow.v2.IReloadDocumentRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IDocument,
-        protos.google.cloud.dialogflow.v2.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Reloads the specified document from its specified source, content_uri or
    * content. The previously loaded content of the document will be deleted.
@@ -1121,10 +1073,45 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.reloadDocument(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2/documents.reload_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_ReloadDocument_async
    */
+  reloadDocument(
+    request?: protos.google.cloud.dialogflow.v2.IReloadDocumentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IDocument,
+        protos.google.cloud.dialogflow.v2.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  reloadDocument(
+    request: protos.google.cloud.dialogflow.v2.IReloadDocumentRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IDocument,
+        protos.google.cloud.dialogflow.v2.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  reloadDocument(
+    request: protos.google.cloud.dialogflow.v2.IReloadDocumentRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IDocument,
+        protos.google.cloud.dialogflow.v2.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   reloadDocument(
     request?: protos.google.cloud.dialogflow.v2.IReloadDocumentRequest,
     optionsOrCallback?:
@@ -1182,11 +1169,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkReloadDocumentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/documents.reload_document.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_ReloadDocument_async
    */
   async checkReloadDocumentProgress(
     name: string
@@ -1210,6 +1194,33 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2.KnowledgeOperationMetadata
     >;
   }
+  /**
+   * Returns the list of all documents of the knowledge base.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The knowledge base to list all documents for.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>`.
+   * @param {number} request.pageSize
+   *   The maximum number of items to return in a single page. By
+   *   default 10 and at most 100.
+   * @param {string} request.pageToken
+   *   The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Document]{@link google.cloud.dialogflow.v2.Document}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listDocumentsAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listDocuments(
     request?: protos.google.cloud.dialogflow.v2.IListDocumentsRequest,
     options?: CallOptions
@@ -1241,33 +1252,6 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2.IDocument
     >
   ): void;
-  /**
-   * Returns the list of all documents of the knowledge base.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The knowledge base to list all documents for.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>`.
-   * @param {number} request.pageSize
-   *   The maximum number of items to return in a single page. By
-   *   default 10 and at most 100.
-   * @param {string} request.pageToken
-   *   The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Document]{@link google.cloud.dialogflow.v2.Document}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listDocumentsAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listDocuments(
     request?: protos.google.cloud.dialogflow.v2.IListDocumentsRequest,
     optionsOrCallback?:
@@ -1384,11 +1368,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listDocumentsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/documents.list_documents.js</caption>
+   * region_tag:dialogflow_v2_generated_Documents_ListDocuments_async
    */
   listDocumentsAsync(
     request?: protos.google.cloud.dialogflow.v2.IListDocumentsRequest,
@@ -1402,7 +1383,6 @@ export class DocumentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listDocuments'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/entity_types_client.ts b/packages/google-cloud-dialogflow/src/v2/entity_types_client.ts
index 6446d5b6124..d33dc7e42a3 100644
--- a/packages/google-cloud-dialogflow/src/v2/entity_types_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/entity_types_client.ts
@@ -528,6 +528,30 @@ export class EntityTypesClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified entity type.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the entity type.
+   *   Format: `projects/<Project ID>/agent/entityTypes/<EntityType ID>`.
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2.EntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/entity_types.get_entity_type.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_GetEntityType_async
+   */
   getEntityType(
     request?: protos.google.cloud.dialogflow.v2.IGetEntityTypeRequest,
     options?: CallOptions
@@ -559,30 +583,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified entity type.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the entity type.
-   *   Format: `projects/<Project ID>/agent/entityTypes/<EntityType ID>`.
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2.EntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getEntityType(request);
-   */
   getEntityType(
     request?: protos.google.cloud.dialogflow.v2.IGetEntityTypeRequest,
     optionsOrCallback?:
@@ -626,6 +626,36 @@ export class EntityTypesClient {
     this.initialize();
     return this.innerApiCalls.getEntityType(request, options, callback);
   }
+  /**
+   * Creates an entity type in the specified agent.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to create a entity type for.
+   *   Format: `projects/<Project ID>/agent`.
+   * @param {google.cloud.dialogflow.v2.EntityType} request.entityType
+   *   Required. The entity type to create.
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2.EntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/entity_types.create_entity_type.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_CreateEntityType_async
+   */
   createEntityType(
     request?: protos.google.cloud.dialogflow.v2.ICreateEntityTypeRequest,
     options?: CallOptions
@@ -657,36 +687,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates an entity type in the specified agent.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to create a entity type for.
-   *   Format: `projects/<Project ID>/agent`.
-   * @param {google.cloud.dialogflow.v2.EntityType} request.entityType
-   *   Required. The entity type to create.
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2.EntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createEntityType(request);
-   */
   createEntityType(
     request?: protos.google.cloud.dialogflow.v2.ICreateEntityTypeRequest,
     optionsOrCallback?:
@@ -730,6 +730,35 @@ export class EntityTypesClient {
     this.initialize();
     return this.innerApiCalls.createEntityType(request, options, callback);
   }
+  /**
+   * Updates the specified entity type.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.EntityType} request.entityType
+   *   Required. The entity type to update.
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2.EntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/entity_types.update_entity_type.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_UpdateEntityType_async
+   */
   updateEntityType(
     request?: protos.google.cloud.dialogflow.v2.IUpdateEntityTypeRequest,
     options?: CallOptions
@@ -761,35 +790,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified entity type.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.EntityType} request.entityType
-   *   Required. The entity type to update.
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2.EntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateEntityType(request);
-   */
   updateEntityType(
     request?: protos.google.cloud.dialogflow.v2.IUpdateEntityTypeRequest,
     optionsOrCallback?:
@@ -833,6 +833,28 @@ export class EntityTypesClient {
     this.initialize();
     return this.innerApiCalls.updateEntityType(request, options, callback);
   }
+  /**
+   * Deletes the specified entity type.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the entity type to delete.
+   *   Format: `projects/<Project ID>/agent/entityTypes/<EntityType ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/entity_types.delete_entity_type.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_DeleteEntityType_async
+   */
   deleteEntityType(
     request?: protos.google.cloud.dialogflow.v2.IDeleteEntityTypeRequest,
     options?: CallOptions
@@ -864,28 +886,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified entity type.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the entity type to delete.
-   *   Format: `projects/<Project ID>/agent/entityTypes/<EntityType ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteEntityType(request);
-   */
   deleteEntityType(
     request?: protos.google.cloud.dialogflow.v2.IDeleteEntityTypeRequest,
     optionsOrCallback?:
@@ -930,42 +930,6 @@ export class EntityTypesClient {
     return this.innerApiCalls.deleteEntityType(request, options, callback);
   }
 
-  batchUpdateEntityTypes(
-    request?: protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchUpdateEntityTypes(
-    request: protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchUpdateEntityTypes(
-    request: protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Updates/Creates multiple entity types in the specified agent.
    *
@@ -1010,10 +974,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchUpdateEntityTypes(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2/entity_types.batch_update_entity_types.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchUpdateEntityTypes_async
    */
+  batchUpdateEntityTypes(
+    request?: protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchUpdateEntityTypes(
+    request: protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchUpdateEntityTypes(
+    request: protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchUpdateEntityTypes(
     request?: protos.google.cloud.dialogflow.v2.IBatchUpdateEntityTypesRequest,
     optionsOrCallback?:
@@ -1075,11 +1074,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchUpdateEntityTypesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/entity_types.batch_update_entity_types.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchUpdateEntityTypes_async
    */
   async checkBatchUpdateEntityTypesProgress(
     name: string
@@ -1103,6 +1099,42 @@ export class EntityTypesClient {
       protos.google.protobuf.Struct
     >;
   }
+  /**
+   * Deletes entity types in the specified agent.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: An empty [Struct
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
+   * - `response`: An [Empty
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the agent to delete all entities types for. Format:
+   *   `projects/<Project ID>/agent`.
+   * @param {string[]} request.entityTypeNames
+   *   Required. The names entity types to delete. All names must point to the
+   *   same agent as `parent`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/entity_types.batch_delete_entity_types.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchDeleteEntityTypes_async
+   */
   batchDeleteEntityTypes(
     request?: protos.google.cloud.dialogflow.v2.IBatchDeleteEntityTypesRequest,
     options?: CallOptions
@@ -1139,43 +1171,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes entity types in the specified agent.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: An empty [Struct
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
-   * - `response`: An [Empty
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the agent to delete all entities types for. Format:
-   *   `projects/<Project ID>/agent`.
-   * @param {string[]} request.entityTypeNames
-   *   Required. The names entity types to delete. All names must point to the
-   *   same agent as `parent`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchDeleteEntityTypes(request);
-   * const [response] = await operation.promise();
-   */
   batchDeleteEntityTypes(
     request?: protos.google.cloud.dialogflow.v2.IBatchDeleteEntityTypesRequest,
     optionsOrCallback?:
@@ -1237,11 +1232,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchDeleteEntityTypesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/entity_types.batch_delete_entity_types.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchDeleteEntityTypes_async
    */
   async checkBatchDeleteEntityTypesProgress(
     name: string
@@ -1249,55 +1241,19 @@ export class EntityTypesClient {
     LROperation<protos.google.protobuf.Empty, protos.google.protobuf.Struct>
   > {
     const request = new operationsProtos.google.longrunning.GetOperationRequest(
-      {name}
-    );
-    const [operation] = await this.operationsClient.getOperation(request);
-    const decodeOperation = new gax.Operation(
-      operation,
-      this.descriptors.longrunning.batchDeleteEntityTypes,
-      gax.createDefaultBackoffSettings()
-    );
-    return decodeOperation as LROperation<
-      protos.google.protobuf.Empty,
-      protos.google.protobuf.Struct
-    >;
-  }
-  batchCreateEntities(
-    request?: protos.google.cloud.dialogflow.v2.IBatchCreateEntitiesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchCreateEntities(
-    request: protos.google.cloud.dialogflow.v2.IBatchCreateEntitiesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchCreateEntities(
-    request: protos.google.cloud.dialogflow.v2.IBatchCreateEntitiesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
+      {name}
+    );
+    const [operation] = await this.operationsClient.getOperation(request);
+    const decodeOperation = new gax.Operation(
+      operation,
+      this.descriptors.longrunning.batchDeleteEntityTypes,
+      gax.createDefaultBackoffSettings()
+    );
+    return decodeOperation as LROperation<
+      protos.google.protobuf.Empty,
+      protos.google.protobuf.Struct
+    >;
+  }
   /**
    * Creates multiple new entities in the specified entity type.
    *
@@ -1336,10 +1292,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchCreateEntities(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2/entity_types.batch_create_entities.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchCreateEntities_async
    */
+  batchCreateEntities(
+    request?: protos.google.cloud.dialogflow.v2.IBatchCreateEntitiesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchCreateEntities(
+    request: protos.google.cloud.dialogflow.v2.IBatchCreateEntitiesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchCreateEntities(
+    request: protos.google.cloud.dialogflow.v2.IBatchCreateEntitiesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchCreateEntities(
     request?: protos.google.cloud.dialogflow.v2.IBatchCreateEntitiesRequest,
     optionsOrCallback?:
@@ -1397,11 +1388,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchCreateEntitiesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/entity_types.batch_create_entities.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchCreateEntities_async
    */
   async checkBatchCreateEntitiesProgress(
     name: string
@@ -1422,42 +1410,6 @@ export class EntityTypesClient {
       protos.google.protobuf.Struct
     >;
   }
-  batchUpdateEntities(
-    request?: protos.google.cloud.dialogflow.v2.IBatchUpdateEntitiesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchUpdateEntities(
-    request: protos.google.cloud.dialogflow.v2.IBatchUpdateEntitiesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchUpdateEntities(
-    request: protos.google.cloud.dialogflow.v2.IBatchUpdateEntitiesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Updates or creates multiple entities in the specified entity type. This
    * method does not affect entities in the entity type that aren't explicitly
@@ -1501,10 +1453,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchUpdateEntities(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2/entity_types.batch_update_entities.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchUpdateEntities_async
    */
+  batchUpdateEntities(
+    request?: protos.google.cloud.dialogflow.v2.IBatchUpdateEntitiesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchUpdateEntities(
+    request: protos.google.cloud.dialogflow.v2.IBatchUpdateEntitiesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchUpdateEntities(
+    request: protos.google.cloud.dialogflow.v2.IBatchUpdateEntitiesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchUpdateEntities(
     request?: protos.google.cloud.dialogflow.v2.IBatchUpdateEntitiesRequest,
     optionsOrCallback?:
@@ -1562,11 +1549,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchUpdateEntitiesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/entity_types.batch_update_entities.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchUpdateEntities_async
    */
   async checkBatchUpdateEntitiesProgress(
     name: string
@@ -1587,42 +1571,6 @@ export class EntityTypesClient {
       protos.google.protobuf.Struct
     >;
   }
-  batchDeleteEntities(
-    request?: protos.google.cloud.dialogflow.v2.IBatchDeleteEntitiesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchDeleteEntities(
-    request: protos.google.cloud.dialogflow.v2.IBatchDeleteEntitiesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchDeleteEntities(
-    request: protos.google.cloud.dialogflow.v2.IBatchDeleteEntitiesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Deletes entities in the specified entity type.
    *
@@ -1663,10 +1611,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchDeleteEntities(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2/entity_types.batch_delete_entities.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchDeleteEntities_async
    */
+  batchDeleteEntities(
+    request?: protos.google.cloud.dialogflow.v2.IBatchDeleteEntitiesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchDeleteEntities(
+    request: protos.google.cloud.dialogflow.v2.IBatchDeleteEntitiesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchDeleteEntities(
+    request: protos.google.cloud.dialogflow.v2.IBatchDeleteEntitiesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchDeleteEntities(
     request?: protos.google.cloud.dialogflow.v2.IBatchDeleteEntitiesRequest,
     optionsOrCallback?:
@@ -1724,11 +1707,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchDeleteEntitiesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/entity_types.batch_delete_entities.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_BatchDeleteEntities_async
    */
   async checkBatchDeleteEntitiesProgress(
     name: string
@@ -1749,37 +1729,6 @@ export class EntityTypesClient {
       protos.google.protobuf.Struct
     >;
   }
-  listEntityTypes(
-    request?: protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IEntityType[],
-      protos.google.cloud.dialogflow.v2.IListEntityTypesRequest | null,
-      protos.google.cloud.dialogflow.v2.IListEntityTypesResponse
-    ]
-  >;
-  listEntityTypes(
-    request: protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
-      | protos.google.cloud.dialogflow.v2.IListEntityTypesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IEntityType
-    >
-  ): void;
-  listEntityTypes(
-    request: protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
-      | protos.google.cloud.dialogflow.v2.IListEntityTypesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.IEntityType
-    >
-  ): void;
   /**
    * Returns the list of all entity types in the specified agent.
    *
@@ -1812,6 +1761,37 @@ export class EntityTypesClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listEntityTypes(
+    request?: protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IEntityType[],
+      protos.google.cloud.dialogflow.v2.IListEntityTypesRequest | null,
+      protos.google.cloud.dialogflow.v2.IListEntityTypesResponse
+    ]
+  >;
+  listEntityTypes(
+    request: protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
+      | protos.google.cloud.dialogflow.v2.IListEntityTypesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IEntityType
+    >
+  ): void;
+  listEntityTypes(
+    request: protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
+      | protos.google.cloud.dialogflow.v2.IListEntityTypesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.IEntityType
+    >
+  ): void;
   listEntityTypes(
     request?: protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
     optionsOrCallback?:
@@ -1938,11 +1918,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listEntityTypesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/entity_types.list_entity_types.js</caption>
+   * region_tag:dialogflow_v2_generated_EntityTypes_ListEntityTypes_async
    */
   listEntityTypesAsync(
     request?: protos.google.cloud.dialogflow.v2.IListEntityTypesRequest,
@@ -1956,7 +1933,6 @@ export class EntityTypesClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listEntityTypes'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/environments_client.ts b/packages/google-cloud-dialogflow/src/v2/environments_client.ts
index 5e6352972e7..d3677da3432 100644
--- a/packages/google-cloud-dialogflow/src/v2/environments_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/environments_client.ts
@@ -445,6 +445,30 @@ export class EnvironmentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified agent environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the environment.
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent/environments/<Environment ID>`
+   *   - `projects/<Project ID>/locations/<Location
+   *     ID>/agent/environments/<Environment ID>`
+   *
+   *   The environment ID for the default environment is `-`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2.Environment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/environments.get_environment.js</caption>
+   * region_tag:dialogflow_v2_generated_Environments_GetEnvironment_async
+   */
   getEnvironment(
     request?: protos.google.cloud.dialogflow.v2.IGetEnvironmentRequest,
     options?: CallOptions
@@ -476,30 +500,6 @@ export class EnvironmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified agent environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the environment.
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent/environments/<Environment ID>`
-   *   - `projects/<Project ID>/locations/<Location
-   *     ID>/agent/environments/<Environment ID>`
-   *
-   *   The environment ID for the default environment is `-`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2.Environment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getEnvironment(request);
-   */
   getEnvironment(
     request?: protos.google.cloud.dialogflow.v2.IGetEnvironmentRequest,
     optionsOrCallback?:
@@ -543,6 +543,31 @@ export class EnvironmentsClient {
     this.initialize();
     return this.innerApiCalls.getEnvironment(request, options, callback);
   }
+  /**
+   * Creates an agent environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to create an environment for.
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent`
+   * @param {google.cloud.dialogflow.v2.Environment} request.environment
+   *   Required. The environment to create.
+   * @param {string} request.environmentId
+   *   Required. The unique id of the new environment.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2.Environment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/environments.create_environment.js</caption>
+   * region_tag:dialogflow_v2_generated_Environments_CreateEnvironment_async
+   */
   createEnvironment(
     request?: protos.google.cloud.dialogflow.v2.ICreateEnvironmentRequest,
     options?: CallOptions
@@ -574,31 +599,6 @@ export class EnvironmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates an agent environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to create an environment for.
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent`
-   * @param {google.cloud.dialogflow.v2.Environment} request.environment
-   *   Required. The environment to create.
-   * @param {string} request.environmentId
-   *   Required. The unique id of the new environment.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2.Environment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createEnvironment(request);
-   */
   createEnvironment(
     request?: protos.google.cloud.dialogflow.v2.ICreateEnvironmentRequest,
     optionsOrCallback?:
@@ -642,37 +642,6 @@ export class EnvironmentsClient {
     this.initialize();
     return this.innerApiCalls.createEnvironment(request, options, callback);
   }
-  updateEnvironment(
-    request?: protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IEnvironment,
-      protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  updateEnvironment(
-    request: protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IEnvironment,
-      | protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  updateEnvironment(
-    request: protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IEnvironment,
-      | protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Updates the specified agent environment.
    *
@@ -705,9 +674,40 @@ export class EnvironmentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.updateEnvironment(request);
+   * @example <caption>include:samples/generated/v2/environments.update_environment.js</caption>
+   * region_tag:dialogflow_v2_generated_Environments_UpdateEnvironment_async
    */
+  updateEnvironment(
+    request?: protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IEnvironment,
+      protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  updateEnvironment(
+    request: protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IEnvironment,
+      | protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  updateEnvironment(
+    request: protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IEnvironment,
+      | protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   updateEnvironment(
     request?: protos.google.cloud.dialogflow.v2.IUpdateEnvironmentRequest,
     optionsOrCallback?:
@@ -751,6 +751,30 @@ export class EnvironmentsClient {
     this.initialize();
     return this.innerApiCalls.updateEnvironment(request, options, callback);
   }
+  /**
+   * Deletes the specified agent environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the environment to delete.
+   *   / Format:
+   *
+   *   - `projects/<Project ID>/agent/environments/<Environment ID>`
+   *   - `projects/<Project ID>/locations/<Location
+   *     ID>/agent/environments/<Environment ID>`
+   *
+   *   The environment ID for the default environment is `-`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/environments.delete_environment.js</caption>
+   * region_tag:dialogflow_v2_generated_Environments_DeleteEnvironment_async
+   */
   deleteEnvironment(
     request?: protos.google.cloud.dialogflow.v2.IDeleteEnvironmentRequest,
     options?: CallOptions
@@ -782,30 +806,6 @@ export class EnvironmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified agent environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the environment to delete.
-   *   / Format:
-   *
-   *   - `projects/<Project ID>/agent/environments/<Environment ID>`
-   *   - `projects/<Project ID>/locations/<Location
-   *     ID>/agent/environments/<Environment ID>`
-   *
-   *   The environment ID for the default environment is `-`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteEnvironment(request);
-   */
   deleteEnvironment(
     request?: protos.google.cloud.dialogflow.v2.IDeleteEnvironmentRequest,
     optionsOrCallback?:
@@ -850,6 +850,35 @@ export class EnvironmentsClient {
     return this.innerApiCalls.deleteEnvironment(request, options, callback);
   }
 
+  /**
+   * Returns the list of all non-default environments of the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to list all environments from.
+   *   Format:
+   *
+   *   - `projects/<Project ID>/agent`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent`
+   * @param {number} [request.pageSize]
+   *   Optional. The maximum number of items to return in a single page. By default 100 and
+   *   at most 1000.
+   * @param {string} [request.pageToken]
+   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Environment]{@link google.cloud.dialogflow.v2.Environment}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listEnvironmentsAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listEnvironments(
     request?: protos.google.cloud.dialogflow.v2.IListEnvironmentsRequest,
     options?: CallOptions
@@ -881,35 +910,6 @@ export class EnvironmentsClient {
       protos.google.cloud.dialogflow.v2.IEnvironment
     >
   ): void;
-  /**
-   * Returns the list of all non-default environments of the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to list all environments from.
-   *   Format:
-   *
-   *   - `projects/<Project ID>/agent`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent`
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By default 100 and
-   *   at most 1000.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Environment]{@link google.cloud.dialogflow.v2.Environment}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listEnvironmentsAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listEnvironments(
     request?: protos.google.cloud.dialogflow.v2.IListEnvironmentsRequest,
     optionsOrCallback?:
@@ -1030,11 +1030,8 @@ export class EnvironmentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listEnvironmentsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/environments.list_environments.js</caption>
+   * region_tag:dialogflow_v2_generated_Environments_ListEnvironments_async
    */
   listEnvironmentsAsync(
     request?: protos.google.cloud.dialogflow.v2.IListEnvironmentsRequest,
@@ -1048,7 +1045,6 @@ export class EnvironmentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listEnvironments'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
@@ -1058,33 +1054,6 @@ export class EnvironmentsClient {
       callSettings
     ) as AsyncIterable<protos.google.cloud.dialogflow.v2.IEnvironment>;
   }
-  getEnvironmentHistory(
-    request?: protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.EnvironmentHistory.IEntry[],
-      protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest | null,
-      protos.google.cloud.dialogflow.v2.IEnvironmentHistory
-    ]
-  >;
-  getEnvironmentHistory(
-    request: protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
-      protos.google.cloud.dialogflow.v2.IEnvironmentHistory | null | undefined,
-      protos.google.cloud.dialogflow.v2.EnvironmentHistory.IEntry
-    >
-  ): void;
-  getEnvironmentHistory(
-    request: protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
-      protos.google.cloud.dialogflow.v2.IEnvironmentHistory | null | undefined,
-      protos.google.cloud.dialogflow.v2.EnvironmentHistory.IEntry
-    >
-  ): void;
   /**
    * Gets the history of the specified environment.
    *
@@ -1117,6 +1086,33 @@ export class EnvironmentsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  getEnvironmentHistory(
+    request?: protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.EnvironmentHistory.IEntry[],
+      protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest | null,
+      protos.google.cloud.dialogflow.v2.IEnvironmentHistory
+    ]
+  >;
+  getEnvironmentHistory(
+    request: protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
+      protos.google.cloud.dialogflow.v2.IEnvironmentHistory | null | undefined,
+      protos.google.cloud.dialogflow.v2.EnvironmentHistory.IEntry
+    >
+  ): void;
+  getEnvironmentHistory(
+    request: protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
+      protos.google.cloud.dialogflow.v2.IEnvironmentHistory | null | undefined,
+      protos.google.cloud.dialogflow.v2.EnvironmentHistory.IEntry
+    >
+  ): void;
   getEnvironmentHistory(
     request?: protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
     optionsOrCallback?:
@@ -1241,11 +1237,8 @@ export class EnvironmentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.getEnvironmentHistoryAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/environments.get_environment_history.js</caption>
+   * region_tag:dialogflow_v2_generated_Environments_GetEnvironmentHistory_async
    */
   getEnvironmentHistoryAsync(
     request?: protos.google.cloud.dialogflow.v2.IGetEnvironmentHistoryRequest,
@@ -1259,7 +1252,6 @@ export class EnvironmentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['getEnvironmentHistory'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/fulfillments_client.ts b/packages/google-cloud-dialogflow/src/v2/fulfillments_client.ts
index 3f9cbf5b749..96806b62676 100644
--- a/packages/google-cloud-dialogflow/src/v2/fulfillments_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/fulfillments_client.ts
@@ -410,6 +410,24 @@ export class FulfillmentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the fulfillment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the fulfillment.
+   *   Format: `projects/<Project ID>/agent/fulfillment`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Fulfillment]{@link google.cloud.dialogflow.v2.Fulfillment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/fulfillments.get_fulfillment.js</caption>
+   * region_tag:dialogflow_v2_generated_Fulfillments_GetFulfillment_async
+   */
   getFulfillment(
     request?: protos.google.cloud.dialogflow.v2.IGetFulfillmentRequest,
     options?: CallOptions
@@ -441,24 +459,6 @@ export class FulfillmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the fulfillment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the fulfillment.
-   *   Format: `projects/<Project ID>/agent/fulfillment`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Fulfillment]{@link google.cloud.dialogflow.v2.Fulfillment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getFulfillment(request);
-   */
   getFulfillment(
     request?: protos.google.cloud.dialogflow.v2.IGetFulfillmentRequest,
     optionsOrCallback?:
@@ -502,6 +502,26 @@ export class FulfillmentsClient {
     this.initialize();
     return this.innerApiCalls.getFulfillment(request, options, callback);
   }
+  /**
+   * Updates the fulfillment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.Fulfillment} request.fulfillment
+   *   Required. The fulfillment to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields get updated. If the mask is not
+   *   present, all fields will be updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Fulfillment]{@link google.cloud.dialogflow.v2.Fulfillment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/fulfillments.update_fulfillment.js</caption>
+   * region_tag:dialogflow_v2_generated_Fulfillments_UpdateFulfillment_async
+   */
   updateFulfillment(
     request?: protos.google.cloud.dialogflow.v2.IUpdateFulfillmentRequest,
     options?: CallOptions
@@ -533,26 +553,6 @@ export class FulfillmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the fulfillment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.Fulfillment} request.fulfillment
-   *   Required. The fulfillment to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields get updated. If the mask is not
-   *   present, all fields will be updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Fulfillment]{@link google.cloud.dialogflow.v2.Fulfillment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateFulfillment(request);
-   */
   updateFulfillment(
     request?: protos.google.cloud.dialogflow.v2.IUpdateFulfillmentRequest,
     optionsOrCallback?:
diff --git a/packages/google-cloud-dialogflow/src/v2/intents_client.ts b/packages/google-cloud-dialogflow/src/v2/intents_client.ts
index 475d20fc869..6c8da94cd46 100644
--- a/packages/google-cloud-dialogflow/src/v2/intents_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/intents_client.ts
@@ -484,6 +484,32 @@ export class IntentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified intent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the intent.
+   *   Format: `projects/<Project ID>/agent/intents/<Intent ID>`.
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {google.cloud.dialogflow.v2.IntentView} [request.intentView]
+   *   Optional. The resource view to apply to the returned intent.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Intent]{@link google.cloud.dialogflow.v2.Intent}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/intents.get_intent.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_GetIntent_async
+   */
   getIntent(
     request?: protos.google.cloud.dialogflow.v2.IGetIntentRequest,
     options?: CallOptions
@@ -511,32 +537,6 @@ export class IntentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified intent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the intent.
-   *   Format: `projects/<Project ID>/agent/intents/<Intent ID>`.
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {google.cloud.dialogflow.v2.IntentView} [request.intentView]
-   *   Optional. The resource view to apply to the returned intent.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Intent]{@link google.cloud.dialogflow.v2.Intent}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getIntent(request);
-   */
   getIntent(
     request?: protos.google.cloud.dialogflow.v2.IGetIntentRequest,
     optionsOrCallback?:
@@ -578,33 +578,6 @@ export class IntentsClient {
     this.initialize();
     return this.innerApiCalls.getIntent(request, options, callback);
   }
-  createIntent(
-    request?: protos.google.cloud.dialogflow.v2.ICreateIntentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IIntent,
-      protos.google.cloud.dialogflow.v2.ICreateIntentRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  createIntent(
-    request: protos.google.cloud.dialogflow.v2.ICreateIntentRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IIntent,
-      protos.google.cloud.dialogflow.v2.ICreateIntentRequest | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  createIntent(
-    request: protos.google.cloud.dialogflow.v2.ICreateIntentRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IIntent,
-      protos.google.cloud.dialogflow.v2.ICreateIntentRequest | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Creates an intent in the specified agent.
    *
@@ -634,9 +607,36 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.createIntent(request);
+   * @example <caption>include:samples/generated/v2/intents.create_intent.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_CreateIntent_async
    */
+  createIntent(
+    request?: protos.google.cloud.dialogflow.v2.ICreateIntentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IIntent,
+      protos.google.cloud.dialogflow.v2.ICreateIntentRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  createIntent(
+    request: protos.google.cloud.dialogflow.v2.ICreateIntentRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IIntent,
+      protos.google.cloud.dialogflow.v2.ICreateIntentRequest | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  createIntent(
+    request: protos.google.cloud.dialogflow.v2.ICreateIntentRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IIntent,
+      protos.google.cloud.dialogflow.v2.ICreateIntentRequest | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   createIntent(
     request?: protos.google.cloud.dialogflow.v2.ICreateIntentRequest,
     optionsOrCallback?:
@@ -678,33 +678,6 @@ export class IntentsClient {
     this.initialize();
     return this.innerApiCalls.createIntent(request, options, callback);
   }
-  updateIntent(
-    request?: protos.google.cloud.dialogflow.v2.IUpdateIntentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IIntent,
-      protos.google.cloud.dialogflow.v2.IUpdateIntentRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  updateIntent(
-    request: protos.google.cloud.dialogflow.v2.IUpdateIntentRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IIntent,
-      protos.google.cloud.dialogflow.v2.IUpdateIntentRequest | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  updateIntent(
-    request: protos.google.cloud.dialogflow.v2.IUpdateIntentRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IIntent,
-      protos.google.cloud.dialogflow.v2.IUpdateIntentRequest | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Updates the specified intent.
    *
@@ -733,9 +706,36 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.updateIntent(request);
+   * @example <caption>include:samples/generated/v2/intents.update_intent.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_UpdateIntent_async
    */
+  updateIntent(
+    request?: protos.google.cloud.dialogflow.v2.IUpdateIntentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IIntent,
+      protos.google.cloud.dialogflow.v2.IUpdateIntentRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  updateIntent(
+    request: protos.google.cloud.dialogflow.v2.IUpdateIntentRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IIntent,
+      protos.google.cloud.dialogflow.v2.IUpdateIntentRequest | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  updateIntent(
+    request: protos.google.cloud.dialogflow.v2.IUpdateIntentRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IIntent,
+      protos.google.cloud.dialogflow.v2.IUpdateIntentRequest | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   updateIntent(
     request?: protos.google.cloud.dialogflow.v2.IUpdateIntentRequest,
     optionsOrCallback?:
@@ -777,6 +777,29 @@ export class IntentsClient {
     this.initialize();
     return this.innerApiCalls.updateIntent(request, options, callback);
   }
+  /**
+   * Deletes the specified intent and its direct or indirect followup intents.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the intent to delete. If this intent has direct or
+   *   indirect followup intents, we also delete them.
+   *   Format: `projects/<Project ID>/agent/intents/<Intent ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/intents.delete_intent.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_DeleteIntent_async
+   */
   deleteIntent(
     request?: protos.google.cloud.dialogflow.v2.IDeleteIntentRequest,
     options?: CallOptions
@@ -804,29 +827,6 @@ export class IntentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified intent and its direct or indirect followup intents.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the intent to delete. If this intent has direct or
-   *   indirect followup intents, we also delete them.
-   *   Format: `projects/<Project ID>/agent/intents/<Intent ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteIntent(request);
-   */
   deleteIntent(
     request?: protos.google.cloud.dialogflow.v2.IDeleteIntentRequest,
     optionsOrCallback?:
@@ -869,42 +869,6 @@ export class IntentsClient {
     return this.innerApiCalls.deleteIntent(request, options, callback);
   }
 
-  batchUpdateIntents(
-    request?: protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchUpdateIntents(
-    request: protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchUpdateIntents(
-    request: protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Updates/Creates multiple intents in the specified agent.
    *
@@ -950,10 +914,45 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchUpdateIntents(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2/intents.batch_update_intents.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_BatchUpdateIntents_async
    */
+  batchUpdateIntents(
+    request?: protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchUpdateIntents(
+    request: protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchUpdateIntents(
+    request: protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchUpdateIntents(
     request?: protos.google.cloud.dialogflow.v2.IBatchUpdateIntentsRequest,
     optionsOrCallback?:
@@ -1011,11 +1010,8 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchUpdateIntentsProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/intents.batch_update_intents.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_BatchUpdateIntents_async
    */
   async checkBatchUpdateIntentsProgress(
     name: string
@@ -1039,6 +1035,42 @@ export class IntentsClient {
       protos.google.protobuf.Struct
     >;
   }
+  /**
+   * Deletes intents in the specified agent.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: An empty [Struct
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
+   * - `response`: An [Empty
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the agent to delete all entities types for. Format:
+   *   `projects/<Project ID>/agent`.
+   * @param {number[]} request.intents
+   *   Required. The collection of intents to delete. Only intent `name` must be
+   *   filled in.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/intents.batch_delete_intents.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_BatchDeleteIntents_async
+   */
   batchDeleteIntents(
     request?: protos.google.cloud.dialogflow.v2.IBatchDeleteIntentsRequest,
     options?: CallOptions
@@ -1075,43 +1107,6 @@ export class IntentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes intents in the specified agent.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: An empty [Struct
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
-   * - `response`: An [Empty
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the agent to delete all entities types for. Format:
-   *   `projects/<Project ID>/agent`.
-   * @param {number[]} request.intents
-   *   Required. The collection of intents to delete. Only intent `name` must be
-   *   filled in.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchDeleteIntents(request);
-   * const [response] = await operation.promise();
-   */
   batchDeleteIntents(
     request?: protos.google.cloud.dialogflow.v2.IBatchDeleteIntentsRequest,
     optionsOrCallback?:
@@ -1169,11 +1164,8 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchDeleteIntentsProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2/intents.batch_delete_intents.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_BatchDeleteIntents_async
    */
   async checkBatchDeleteIntentsProgress(
     name: string
@@ -1194,33 +1186,6 @@ export class IntentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  listIntents(
-    request?: protos.google.cloud.dialogflow.v2.IListIntentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IIntent[],
-      protos.google.cloud.dialogflow.v2.IListIntentsRequest | null,
-      protos.google.cloud.dialogflow.v2.IListIntentsResponse
-    ]
-  >;
-  listIntents(
-    request: protos.google.cloud.dialogflow.v2.IListIntentsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListIntentsRequest,
-      protos.google.cloud.dialogflow.v2.IListIntentsResponse | null | undefined,
-      protos.google.cloud.dialogflow.v2.IIntent
-    >
-  ): void;
-  listIntents(
-    request: protos.google.cloud.dialogflow.v2.IListIntentsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListIntentsRequest,
-      protos.google.cloud.dialogflow.v2.IListIntentsResponse | null | undefined,
-      protos.google.cloud.dialogflow.v2.IIntent
-    >
-  ): void;
   /**
    * Returns the list of all intents in the specified agent.
    *
@@ -1263,6 +1228,33 @@ export class IntentsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listIntents(
+    request?: protos.google.cloud.dialogflow.v2.IListIntentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IIntent[],
+      protos.google.cloud.dialogflow.v2.IListIntentsRequest | null,
+      protos.google.cloud.dialogflow.v2.IListIntentsResponse
+    ]
+  >;
+  listIntents(
+    request: protos.google.cloud.dialogflow.v2.IListIntentsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListIntentsRequest,
+      protos.google.cloud.dialogflow.v2.IListIntentsResponse | null | undefined,
+      protos.google.cloud.dialogflow.v2.IIntent
+    >
+  ): void;
+  listIntents(
+    request: protos.google.cloud.dialogflow.v2.IListIntentsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListIntentsRequest,
+      protos.google.cloud.dialogflow.v2.IListIntentsResponse | null | undefined,
+      protos.google.cloud.dialogflow.v2.IIntent
+    >
+  ): void;
   listIntents(
     request?: protos.google.cloud.dialogflow.v2.IListIntentsRequest,
     optionsOrCallback?:
@@ -1407,11 +1399,8 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listIntentsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/intents.list_intents.js</caption>
+   * region_tag:dialogflow_v2_generated_Intents_ListIntents_async
    */
   listIntentsAsync(
     request?: protos.google.cloud.dialogflow.v2.IListIntentsRequest,
@@ -1425,7 +1414,6 @@ export class IntentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listIntents'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/knowledge_bases_client.ts b/packages/google-cloud-dialogflow/src/v2/knowledge_bases_client.ts
index cc1afec5a75..f1a2e290dc3 100644
--- a/packages/google-cloud-dialogflow/src/v2/knowledge_bases_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/knowledge_bases_client.ts
@@ -439,6 +439,25 @@ export class KnowledgeBasesClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified knowledge base.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the knowledge base to retrieve.
+   *   Format `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2.KnowledgeBase}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/knowledge_bases.get_knowledge_base.js</caption>
+   * region_tag:dialogflow_v2_generated_KnowledgeBases_GetKnowledgeBase_async
+   */
   getKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2.IGetKnowledgeBaseRequest,
     options?: CallOptions
@@ -470,25 +489,6 @@ export class KnowledgeBasesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified knowledge base.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the knowledge base to retrieve.
-   *   Format `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2.KnowledgeBase}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getKnowledgeBase(request);
-   */
   getKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2.IGetKnowledgeBaseRequest,
     optionsOrCallback?:
@@ -532,6 +532,26 @@ export class KnowledgeBasesClient {
     this.initialize();
     return this.innerApiCalls.getKnowledgeBase(request, options, callback);
   }
+  /**
+   * Creates a knowledge base.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project to create a knowledge base for.
+   *   Format: `projects/<Project ID>/locations/<Location ID>`.
+   * @param {google.cloud.dialogflow.v2.KnowledgeBase} request.knowledgeBase
+   *   Required. The knowledge base to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2.KnowledgeBase}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/knowledge_bases.create_knowledge_base.js</caption>
+   * region_tag:dialogflow_v2_generated_KnowledgeBases_CreateKnowledgeBase_async
+   */
   createKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2.ICreateKnowledgeBaseRequest,
     options?: CallOptions
@@ -563,26 +583,6 @@ export class KnowledgeBasesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a knowledge base.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project to create a knowledge base for.
-   *   Format: `projects/<Project ID>/locations/<Location ID>`.
-   * @param {google.cloud.dialogflow.v2.KnowledgeBase} request.knowledgeBase
-   *   Required. The knowledge base to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2.KnowledgeBase}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createKnowledgeBase(request);
-   */
   createKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2.ICreateKnowledgeBaseRequest,
     optionsOrCallback?:
@@ -626,6 +626,28 @@ export class KnowledgeBasesClient {
     this.initialize();
     return this.innerApiCalls.createKnowledgeBase(request, options, callback);
   }
+  /**
+   * Deletes the specified knowledge base.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the knowledge base to delete.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>`.
+   * @param {boolean} [request.force]
+   *   Optional. Force deletes the knowledge base. When set to true, any documents
+   *   in the knowledge base are also deleted.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/knowledge_bases.delete_knowledge_base.js</caption>
+   * region_tag:dialogflow_v2_generated_KnowledgeBases_DeleteKnowledgeBase_async
+   */
   deleteKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2.IDeleteKnowledgeBaseRequest,
     options?: CallOptions
@@ -657,28 +679,6 @@ export class KnowledgeBasesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified knowledge base.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the knowledge base to delete.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>`.
-   * @param {boolean} [request.force]
-   *   Optional. Force deletes the knowledge base. When set to true, any documents
-   *   in the knowledge base are also deleted.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteKnowledgeBase(request);
-   */
   deleteKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2.IDeleteKnowledgeBaseRequest,
     optionsOrCallback?:
@@ -722,6 +722,27 @@ export class KnowledgeBasesClient {
     this.initialize();
     return this.innerApiCalls.deleteKnowledgeBase(request, options, callback);
   }
+  /**
+   * Updates the specified knowledge base.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.KnowledgeBase} request.knowledgeBase
+   *   Required. The knowledge base to update.
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. Not specified means `update all`.
+   *   Currently, only `display_name` can be updated, an InvalidArgument will be
+   *   returned for attempting to update other fields.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2.KnowledgeBase}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/knowledge_bases.update_knowledge_base.js</caption>
+   * region_tag:dialogflow_v2_generated_KnowledgeBases_UpdateKnowledgeBase_async
+   */
   updateKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2.IUpdateKnowledgeBaseRequest,
     options?: CallOptions
@@ -753,27 +774,6 @@ export class KnowledgeBasesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified knowledge base.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.KnowledgeBase} request.knowledgeBase
-   *   Required. The knowledge base to update.
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. Not specified means `update all`.
-   *   Currently, only `display_name` can be updated, an InvalidArgument will be
-   *   returned for attempting to update other fields.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2.KnowledgeBase}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateKnowledgeBase(request);
-   */
   updateKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2.IUpdateKnowledgeBaseRequest,
     optionsOrCallback?:
@@ -818,6 +818,32 @@ export class KnowledgeBasesClient {
     return this.innerApiCalls.updateKnowledgeBase(request, options, callback);
   }
 
+  /**
+   * Returns the list of all knowledge bases of the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project to list of knowledge bases for.
+   *   Format: `projects/<Project ID>/locations/<Location ID>`.
+   * @param {number} request.pageSize
+   *   The maximum number of items to return in a single page. By
+   *   default 10 and at most 100.
+   * @param {string} request.pageToken
+   *   The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [KnowledgeBase]{@link google.cloud.dialogflow.v2.KnowledgeBase}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listKnowledgeBasesAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listKnowledgeBases(
     request?: protos.google.cloud.dialogflow.v2.IListKnowledgeBasesRequest,
     options?: CallOptions
@@ -849,32 +875,6 @@ export class KnowledgeBasesClient {
       protos.google.cloud.dialogflow.v2.IKnowledgeBase
     >
   ): void;
-  /**
-   * Returns the list of all knowledge bases of the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project to list of knowledge bases for.
-   *   Format: `projects/<Project ID>/locations/<Location ID>`.
-   * @param {number} request.pageSize
-   *   The maximum number of items to return in a single page. By
-   *   default 10 and at most 100.
-   * @param {string} request.pageToken
-   *   The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [KnowledgeBase]{@link google.cloud.dialogflow.v2.KnowledgeBase}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listKnowledgeBasesAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listKnowledgeBases(
     request?: protos.google.cloud.dialogflow.v2.IListKnowledgeBasesRequest,
     optionsOrCallback?:
@@ -989,11 +989,8 @@ export class KnowledgeBasesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listKnowledgeBasesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/knowledge_bases.list_knowledge_bases.js</caption>
+   * region_tag:dialogflow_v2_generated_KnowledgeBases_ListKnowledgeBases_async
    */
   listKnowledgeBasesAsync(
     request?: protos.google.cloud.dialogflow.v2.IListKnowledgeBasesRequest,
@@ -1007,7 +1004,6 @@ export class KnowledgeBasesClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listKnowledgeBases'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/participants_client.ts b/packages/google-cloud-dialogflow/src/v2/participants_client.ts
index 5880a798ba0..551e5aac8ad 100644
--- a/packages/google-cloud-dialogflow/src/v2/participants_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/participants_client.ts
@@ -441,6 +441,27 @@ export class ParticipantsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Creates a new participant in a conversation.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. Resource identifier of the conversation adding the participant.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>`.
+   * @param {google.cloud.dialogflow.v2.Participant} request.participant
+   *   Required. The participant to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2.Participant}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/participants.create_participant.js</caption>
+   * region_tag:dialogflow_v2_generated_Participants_CreateParticipant_async
+   */
   createParticipant(
     request?: protos.google.cloud.dialogflow.v2.ICreateParticipantRequest,
     options?: CallOptions
@@ -472,27 +493,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a new participant in a conversation.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. Resource identifier of the conversation adding the participant.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>`.
-   * @param {google.cloud.dialogflow.v2.Participant} request.participant
-   *   Required. The participant to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2.Participant}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createParticipant(request);
-   */
   createParticipant(
     request?: protos.google.cloud.dialogflow.v2.ICreateParticipantRequest,
     optionsOrCallback?:
@@ -536,6 +536,25 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.createParticipant(request, options, callback);
   }
+  /**
+   * Retrieves a conversation participant.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the participant. Format:
+   *   `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
+   *   ID>/participants/<Participant ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2.Participant}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/participants.get_participant.js</caption>
+   * region_tag:dialogflow_v2_generated_Participants_GetParticipant_async
+   */
   getParticipant(
     request?: protos.google.cloud.dialogflow.v2.IGetParticipantRequest,
     options?: CallOptions
@@ -567,25 +586,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves a conversation participant.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the participant. Format:
-   *   `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
-   *   ID>/participants/<Participant ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2.Participant}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getParticipant(request);
-   */
   getParticipant(
     request?: protos.google.cloud.dialogflow.v2.IGetParticipantRequest,
     optionsOrCallback?:
@@ -629,6 +629,25 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.getParticipant(request, options, callback);
   }
+  /**
+   * Updates the specified participant.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.Participant} request.participant
+   *   Required. The participant to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to specify which fields to update.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2.Participant}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/participants.update_participant.js</caption>
+   * region_tag:dialogflow_v2_generated_Participants_UpdateParticipant_async
+   */
   updateParticipant(
     request?: protos.google.cloud.dialogflow.v2.IUpdateParticipantRequest,
     options?: CallOptions
@@ -660,25 +679,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified participant.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.Participant} request.participant
-   *   Required. The participant to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to specify which fields to update.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2.Participant}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateParticipant(request);
-   */
   updateParticipant(
     request?: protos.google.cloud.dialogflow.v2.IUpdateParticipantRequest,
     optionsOrCallback?:
@@ -722,37 +722,6 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.updateParticipant(request, options, callback);
   }
-  analyzeContent(
-    request?: protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IAnalyzeContentResponse,
-      protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  analyzeContent(
-    request: protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IAnalyzeContentResponse,
-      | protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  analyzeContent(
-    request: protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IAnalyzeContentResponse,
-      | protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Adds a text (chat, for example), or audio (phone recording, for example)
    * message from a participant into the conversation.
@@ -790,9 +759,40 @@ export class ParticipantsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.analyzeContent(request);
+   * @example <caption>include:samples/generated/v2/participants.analyze_content.js</caption>
+   * region_tag:dialogflow_v2_generated_Participants_AnalyzeContent_async
    */
+  analyzeContent(
+    request?: protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IAnalyzeContentResponse,
+      protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  analyzeContent(
+    request: protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IAnalyzeContentResponse,
+      | protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  analyzeContent(
+    request: protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IAnalyzeContentResponse,
+      | protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   analyzeContent(
     request?: protos.google.cloud.dialogflow.v2.IAnalyzeContentRequest,
     optionsOrCallback?:
@@ -836,6 +836,36 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.analyzeContent(request, options, callback);
   }
+  /**
+   * Gets suggested articles for a participant based on specific historical
+   * messages.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the participant to fetch suggestion for.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
+   * @param {string} request.latestMessage
+   *   The name of the latest conversation message to compile suggestion
+   *   for. If empty, it will be the latest message of the conversation.
+   *
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>/messages/<Message ID>`.
+   * @param {number} request.contextSize
+   *   Max number of messages prior to and including
+   *   {@link google.cloud.dialogflow.v2.SuggestArticlesRequest.latest_message|latest_message} to use as context
+   *   when compiling the suggestion. By default 20 and at most 50.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SuggestArticlesResponse]{@link google.cloud.dialogflow.v2.SuggestArticlesResponse}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/participants.suggest_articles.js</caption>
+   * region_tag:dialogflow_v2_generated_Participants_SuggestArticles_async
+   */
   suggestArticles(
     request?: protos.google.cloud.dialogflow.v2.ISuggestArticlesRequest,
     options?: CallOptions
@@ -867,36 +897,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Gets suggested articles for a participant based on specific historical
-   * messages.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the participant to fetch suggestion for.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
-   * @param {string} request.latestMessage
-   *   The name of the latest conversation message to compile suggestion
-   *   for. If empty, it will be the latest message of the conversation.
-   *
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>/messages/<Message ID>`.
-   * @param {number} request.contextSize
-   *   Max number of messages prior to and including
-   *   {@link google.cloud.dialogflow.v2.SuggestArticlesRequest.latest_message|latest_message} to use as context
-   *   when compiling the suggestion. By default 20 and at most 50.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SuggestArticlesResponse]{@link google.cloud.dialogflow.v2.SuggestArticlesResponse}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.suggestArticles(request);
-   */
   suggestArticles(
     request?: protos.google.cloud.dialogflow.v2.ISuggestArticlesRequest,
     optionsOrCallback?:
@@ -940,6 +940,36 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.suggestArticles(request, options, callback);
   }
+  /**
+   * Gets suggested faq answers for a participant based on specific historical
+   * messages.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the participant to fetch suggestion for.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
+   * @param {string} request.latestMessage
+   *   The name of the latest conversation message to compile suggestion
+   *   for. If empty, it will be the latest message of the conversation.
+   *
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>/messages/<Message ID>`.
+   * @param {number} request.contextSize
+   *   Max number of messages prior to and including
+   *   [latest_message] to use as context when compiling the
+   *   suggestion. By default 20 and at most 50.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SuggestFaqAnswersResponse]{@link google.cloud.dialogflow.v2.SuggestFaqAnswersResponse}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/participants.suggest_faq_answers.js</caption>
+   * region_tag:dialogflow_v2_generated_Participants_SuggestFaqAnswers_async
+   */
   suggestFaqAnswers(
     request?: protos.google.cloud.dialogflow.v2.ISuggestFaqAnswersRequest,
     options?: CallOptions
@@ -971,36 +1001,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Gets suggested faq answers for a participant based on specific historical
-   * messages.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the participant to fetch suggestion for.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
-   * @param {string} request.latestMessage
-   *   The name of the latest conversation message to compile suggestion
-   *   for. If empty, it will be the latest message of the conversation.
-   *
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>/messages/<Message ID>`.
-   * @param {number} request.contextSize
-   *   Max number of messages prior to and including
-   *   [latest_message] to use as context when compiling the
-   *   suggestion. By default 20 and at most 50.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SuggestFaqAnswersResponse]{@link google.cloud.dialogflow.v2.SuggestFaqAnswersResponse}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.suggestFaqAnswers(request);
-   */
   suggestFaqAnswers(
     request?: protos.google.cloud.dialogflow.v2.ISuggestFaqAnswersRequest,
     optionsOrCallback?:
@@ -1045,6 +1045,33 @@ export class ParticipantsClient {
     return this.innerApiCalls.suggestFaqAnswers(request, options, callback);
   }
 
+  /**
+   * Returns the list of all participants in the specified conversation.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The conversation to list all participants from.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>`.
+   * @param {number} [request.pageSize]
+   *   Optional. The maximum number of items to return in a single page. By
+   *   default 100 and at most 1000.
+   * @param {string} [request.pageToken]
+   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Participant]{@link google.cloud.dialogflow.v2.Participant}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listParticipantsAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listParticipants(
     request?: protos.google.cloud.dialogflow.v2.IListParticipantsRequest,
     options?: CallOptions
@@ -1076,33 +1103,6 @@ export class ParticipantsClient {
       protos.google.cloud.dialogflow.v2.IParticipant
     >
   ): void;
-  /**
-   * Returns the list of all participants in the specified conversation.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The conversation to list all participants from.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>`.
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By
-   *   default 100 and at most 1000.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Participant]{@link google.cloud.dialogflow.v2.Participant}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listParticipantsAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listParticipants(
     request?: protos.google.cloud.dialogflow.v2.IListParticipantsRequest,
     optionsOrCallback?:
@@ -1219,11 +1219,8 @@ export class ParticipantsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listParticipantsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/participants.list_participants.js</caption>
+   * region_tag:dialogflow_v2_generated_Participants_ListParticipants_async
    */
   listParticipantsAsync(
     request?: protos.google.cloud.dialogflow.v2.IListParticipantsRequest,
@@ -1237,7 +1234,6 @@ export class ParticipantsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listParticipants'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/session_entity_types_client.ts b/packages/google-cloud-dialogflow/src/v2/session_entity_types_client.ts
index 9d4726f54d3..9abcee99f8b 100644
--- a/packages/google-cloud-dialogflow/src/v2/session_entity_types_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/session_entity_types_client.ts
@@ -442,6 +442,33 @@ export class SessionEntityTypesClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified session entity type.
+   *
+   * This method doesn't work with Google Assistant integration.
+   * Contact Dialogflow support if you need to use session entities
+   * with Google Assistant integration.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the session entity type. Format:
+   *   `projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity Type
+   *   Display Name>` or `projects/<Project ID>/agent/environments/<Environment
+   *   ID>/users/<User ID>/sessions/<Session ID>/entityTypes/<Entity Type Display
+   *   Name>`.
+   *   If `Environment ID` is not specified, we assume default 'draft'
+   *   environment. If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2.SessionEntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/session_entity_types.get_session_entity_type.js</caption>
+   * region_tag:dialogflow_v2_generated_SessionEntityTypes_GetSessionEntityType_async
+   */
   getSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2.IGetSessionEntityTypeRequest,
     options?: CallOptions
@@ -476,33 +503,6 @@ export class SessionEntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified session entity type.
-   *
-   * This method doesn't work with Google Assistant integration.
-   * Contact Dialogflow support if you need to use session entities
-   * with Google Assistant integration.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the session entity type. Format:
-   *   `projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity Type
-   *   Display Name>` or `projects/<Project ID>/agent/environments/<Environment
-   *   ID>/users/<User ID>/sessions/<Session ID>/entityTypes/<Entity Type Display
-   *   Name>`.
-   *   If `Environment ID` is not specified, we assume default 'draft'
-   *   environment. If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2.SessionEntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getSessionEntityType(request);
-   */
   getSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2.IGetSessionEntityTypeRequest,
     optionsOrCallback?:
@@ -549,6 +549,37 @@ export class SessionEntityTypesClient {
     this.initialize();
     return this.innerApiCalls.getSessionEntityType(request, options, callback);
   }
+  /**
+   * Creates a session entity type.
+   *
+   * If the specified session entity type already exists, overrides the session
+   * entity type.
+   *
+   * This method doesn't work with Google Assistant integration.
+   * Contact Dialogflow support if you need to use session entities
+   * with Google Assistant integration.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The session to create a session entity type for.
+   *   Format: `projects/<Project ID>/agent/sessions/<Session ID>` or
+   *   `projects/<Project ID>/agent/environments/<Environment ID>/users/<User ID>/
+   *   sessions/<Session ID>`.
+   *   If `Environment ID` is not specified, we assume default 'draft'
+   *   environment. If `User ID` is not specified, we assume default '-' user.
+   * @param {google.cloud.dialogflow.v2.SessionEntityType} request.sessionEntityType
+   *   Required. The session entity type to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2.SessionEntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/session_entity_types.create_session_entity_type.js</caption>
+   * region_tag:dialogflow_v2_generated_SessionEntityTypes_CreateSessionEntityType_async
+   */
   createSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2.ICreateSessionEntityTypeRequest,
     options?: CallOptions
@@ -583,37 +614,6 @@ export class SessionEntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a session entity type.
-   *
-   * If the specified session entity type already exists, overrides the session
-   * entity type.
-   *
-   * This method doesn't work with Google Assistant integration.
-   * Contact Dialogflow support if you need to use session entities
-   * with Google Assistant integration.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The session to create a session entity type for.
-   *   Format: `projects/<Project ID>/agent/sessions/<Session ID>` or
-   *   `projects/<Project ID>/agent/environments/<Environment ID>/users/<User ID>/
-   *   sessions/<Session ID>`.
-   *   If `Environment ID` is not specified, we assume default 'draft'
-   *   environment. If `User ID` is not specified, we assume default '-' user.
-   * @param {google.cloud.dialogflow.v2.SessionEntityType} request.sessionEntityType
-   *   Required. The session entity type to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2.SessionEntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createSessionEntityType(request);
-   */
   createSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2.ICreateSessionEntityTypeRequest,
     optionsOrCallback?:
@@ -664,6 +664,29 @@ export class SessionEntityTypesClient {
       callback
     );
   }
+  /**
+   * Updates the specified session entity type.
+   *
+   * This method doesn't work with Google Assistant integration.
+   * Contact Dialogflow support if you need to use session entities
+   * with Google Assistant integration.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.SessionEntityType} request.sessionEntityType
+   *   Required. The session entity type to update.
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2.SessionEntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/session_entity_types.update_session_entity_type.js</caption>
+   * region_tag:dialogflow_v2_generated_SessionEntityTypes_UpdateSessionEntityType_async
+   */
   updateSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2.IUpdateSessionEntityTypeRequest,
     options?: CallOptions
@@ -698,29 +721,6 @@ export class SessionEntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified session entity type.
-   *
-   * This method doesn't work with Google Assistant integration.
-   * Contact Dialogflow support if you need to use session entities
-   * with Google Assistant integration.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.SessionEntityType} request.sessionEntityType
-   *   Required. The session entity type to update.
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2.SessionEntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateSessionEntityType(request);
-   */
   updateSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2.IUpdateSessionEntityTypeRequest,
     optionsOrCallback?:
@@ -771,6 +771,33 @@ export class SessionEntityTypesClient {
       callback
     );
   }
+  /**
+   * Deletes the specified session entity type.
+   *
+   * This method doesn't work with Google Assistant integration.
+   * Contact Dialogflow support if you need to use session entities
+   * with Google Assistant integration.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the entity type to delete. Format:
+   *   `projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity Type
+   *   Display Name>` or `projects/<Project ID>/agent/environments/<Environment
+   *   ID>/users/<User ID>/sessions/<Session ID>/entityTypes/<Entity Type Display
+   *   Name>`.
+   *   If `Environment ID` is not specified, we assume default 'draft'
+   *   environment. If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/session_entity_types.delete_session_entity_type.js</caption>
+   * region_tag:dialogflow_v2_generated_SessionEntityTypes_DeleteSessionEntityType_async
+   */
   deleteSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2.IDeleteSessionEntityTypeRequest,
     options?: CallOptions
@@ -805,33 +832,6 @@ export class SessionEntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified session entity type.
-   *
-   * This method doesn't work with Google Assistant integration.
-   * Contact Dialogflow support if you need to use session entities
-   * with Google Assistant integration.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the entity type to delete. Format:
-   *   `projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity Type
-   *   Display Name>` or `projects/<Project ID>/agent/environments/<Environment
-   *   ID>/users/<User ID>/sessions/<Session ID>/entityTypes/<Entity Type Display
-   *   Name>`.
-   *   If `Environment ID` is not specified, we assume default 'draft'
-   *   environment. If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteSessionEntityType(request);
-   */
   deleteSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2.IDeleteSessionEntityTypeRequest,
     optionsOrCallback?:
@@ -883,37 +883,6 @@ export class SessionEntityTypesClient {
     );
   }
 
-  listSessionEntityTypes(
-    request?: protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.ISessionEntityType[],
-      protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest | null,
-      protos.google.cloud.dialogflow.v2.IListSessionEntityTypesResponse
-    ]
-  >;
-  listSessionEntityTypes(
-    request: protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
-      | protos.google.cloud.dialogflow.v2.IListSessionEntityTypesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.ISessionEntityType
-    >
-  ): void;
-  listSessionEntityTypes(
-    request: protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
-      | protos.google.cloud.dialogflow.v2.IListSessionEntityTypesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2.ISessionEntityType
-    >
-  ): void;
   /**
    * Returns the list of all session entity types in the specified session.
    *
@@ -948,6 +917,37 @@ export class SessionEntityTypesClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listSessionEntityTypes(
+    request?: protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.ISessionEntityType[],
+      protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest | null,
+      protos.google.cloud.dialogflow.v2.IListSessionEntityTypesResponse
+    ]
+  >;
+  listSessionEntityTypes(
+    request: protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
+      | protos.google.cloud.dialogflow.v2.IListSessionEntityTypesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.ISessionEntityType
+    >
+  ): void;
+  listSessionEntityTypes(
+    request: protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
+      | protos.google.cloud.dialogflow.v2.IListSessionEntityTypesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2.ISessionEntityType
+    >
+  ): void;
   listSessionEntityTypes(
     request?: protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
     optionsOrCallback?:
@@ -1074,11 +1074,8 @@ export class SessionEntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listSessionEntityTypesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/session_entity_types.list_session_entity_types.js</caption>
+   * region_tag:dialogflow_v2_generated_SessionEntityTypes_ListSessionEntityTypes_async
    */
   listSessionEntityTypesAsync(
     request?: protos.google.cloud.dialogflow.v2.IListSessionEntityTypesRequest,
@@ -1092,7 +1089,6 @@ export class SessionEntityTypesClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listSessionEntityTypes'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/sessions_client.ts b/packages/google-cloud-dialogflow/src/v2/sessions_client.ts
index a5fb03cda56..f0c43f1fa6c 100644
--- a/packages/google-cloud-dialogflow/src/v2/sessions_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/sessions_client.ts
@@ -435,33 +435,6 @@ export class SessionsClient {
   // -------------------
   // -- Service calls --
   // -------------------
-  detectIntent(
-    request?: protos.google.cloud.dialogflow.v2.IDetectIntentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2.IDetectIntentResponse,
-      protos.google.cloud.dialogflow.v2.IDetectIntentRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  detectIntent(
-    request: protos.google.cloud.dialogflow.v2.IDetectIntentRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IDetectIntentResponse,
-      protos.google.cloud.dialogflow.v2.IDetectIntentRequest | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  detectIntent(
-    request: protos.google.cloud.dialogflow.v2.IDetectIntentRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2.IDetectIntentResponse,
-      protos.google.cloud.dialogflow.v2.IDetectIntentRequest | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Processes a natural language query and returns structured, actionable data
    * as a result. This method is not idempotent, because it may cause contexts
@@ -532,9 +505,36 @@ export class SessionsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.detectIntent(request);
+   * @example <caption>include:samples/generated/v2/sessions.detect_intent.js</caption>
+   * region_tag:dialogflow_v2_generated_Sessions_DetectIntent_async
    */
+  detectIntent(
+    request?: protos.google.cloud.dialogflow.v2.IDetectIntentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2.IDetectIntentResponse,
+      protos.google.cloud.dialogflow.v2.IDetectIntentRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  detectIntent(
+    request: protos.google.cloud.dialogflow.v2.IDetectIntentRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IDetectIntentResponse,
+      protos.google.cloud.dialogflow.v2.IDetectIntentRequest | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  detectIntent(
+    request: protos.google.cloud.dialogflow.v2.IDetectIntentRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2.IDetectIntentResponse,
+      protos.google.cloud.dialogflow.v2.IDetectIntentRequest | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   detectIntent(
     request?: protos.google.cloud.dialogflow.v2.IDetectIntentRequest,
     optionsOrCallback?:
@@ -602,12 +602,8 @@ export class SessionsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#bi-directional-streaming)
    *   for more details and examples.
-   * @example
-   * const stream = client.streamingDetectIntent();
-   * stream.on('data', (response) => { ... });
-   * stream.on('end', () => { ... });
-   * stream.write(request);
-   * stream.end();
+   * @example <caption>include:samples/generated/v2/sessions.streaming_detect_intent.js</caption>
+   * region_tag:dialogflow_v2_generated_Sessions_StreamingDetectIntent_async
    */
   streamingDetectIntent(options?: CallOptions): gax.CancellableStream {
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2/versions_client.ts b/packages/google-cloud-dialogflow/src/v2/versions_client.ts
index 893a0858650..81c69de854c 100644
--- a/packages/google-cloud-dialogflow/src/v2/versions_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2/versions_client.ts
@@ -439,6 +439,28 @@ export class VersionsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified agent version.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the version.
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent/versions/<Version ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
+   *     ID>`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2.Version}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/versions.get_version.js</caption>
+   * region_tag:dialogflow_v2_generated_Versions_GetVersion_async
+   */
   getVersion(
     request?: protos.google.cloud.dialogflow.v2.IGetVersionRequest,
     options?: CallOptions
@@ -466,28 +488,6 @@ export class VersionsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified agent version.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the version.
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent/versions/<Version ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
-   *     ID>`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2.Version}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getVersion(request);
-   */
   getVersion(
     request?: protos.google.cloud.dialogflow.v2.IGetVersionRequest,
     optionsOrCallback?:
@@ -529,6 +529,31 @@ export class VersionsClient {
     this.initialize();
     return this.innerApiCalls.getVersion(request, options, callback);
   }
+  /**
+   * Creates an agent version.
+   *
+   * The new version points to the agent instance in the "default" environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to create a version for.
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent`
+   * @param {google.cloud.dialogflow.v2.Version} request.version
+   *   Required. The version to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2.Version}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/versions.create_version.js</caption>
+   * region_tag:dialogflow_v2_generated_Versions_CreateVersion_async
+   */
   createVersion(
     request?: protos.google.cloud.dialogflow.v2.ICreateVersionRequest,
     options?: CallOptions
@@ -560,31 +585,6 @@ export class VersionsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates an agent version.
-   *
-   * The new version points to the agent instance in the "default" environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to create a version for.
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent`
-   * @param {google.cloud.dialogflow.v2.Version} request.version
-   *   Required. The version to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2.Version}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createVersion(request);
-   */
   createVersion(
     request?: protos.google.cloud.dialogflow.v2.ICreateVersionRequest,
     optionsOrCallback?:
@@ -628,6 +628,34 @@ export class VersionsClient {
     this.initialize();
     return this.innerApiCalls.createVersion(request, options, callback);
   }
+  /**
+   * Updates the specified agent version.
+   *
+   * Note that this method does not allow you to update the state of the agent
+   * the given version points to. It allows you to update only mutable
+   * properties of the version resource.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2.Version} request.version
+   *   Required. The version to update.
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent/versions/<Version ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
+   *     ID>`
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2.Version}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/versions.update_version.js</caption>
+   * region_tag:dialogflow_v2_generated_Versions_UpdateVersion_async
+   */
   updateVersion(
     request?: protos.google.cloud.dialogflow.v2.IUpdateVersionRequest,
     options?: CallOptions
@@ -659,34 +687,6 @@ export class VersionsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified agent version.
-   *
-   * Note that this method does not allow you to update the state of the agent
-   * the given version points to. It allows you to update only mutable
-   * properties of the version resource.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2.Version} request.version
-   *   Required. The version to update.
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent/versions/<Version ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
-   *     ID>`
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2.Version}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateVersion(request);
-   */
   updateVersion(
     request?: protos.google.cloud.dialogflow.v2.IUpdateVersionRequest,
     optionsOrCallback?:
@@ -730,6 +730,28 @@ export class VersionsClient {
     this.initialize();
     return this.innerApiCalls.updateVersion(request, options, callback);
   }
+  /**
+   * Delete the specified agent version.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the version to delete.
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent/versions/<Version ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
+   *     ID>`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2/versions.delete_version.js</caption>
+   * region_tag:dialogflow_v2_generated_Versions_DeleteVersion_async
+   */
   deleteVersion(
     request?: protos.google.cloud.dialogflow.v2.IDeleteVersionRequest,
     options?: CallOptions
@@ -761,28 +783,6 @@ export class VersionsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Delete the specified agent version.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the version to delete.
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent/versions/<Version ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
-   *     ID>`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteVersion(request);
-   */
   deleteVersion(
     request?: protos.google.cloud.dialogflow.v2.IDeleteVersionRequest,
     optionsOrCallback?:
@@ -827,6 +827,35 @@ export class VersionsClient {
     return this.innerApiCalls.deleteVersion(request, options, callback);
   }
 
+  /**
+   * Returns the list of all versions of the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to list all versions from.
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent`
+   * @param {number} [request.pageSize]
+   *   Optional. The maximum number of items to return in a single page. By default 100 and
+   *   at most 1000.
+   * @param {string} [request.pageToken]
+   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Version]{@link google.cloud.dialogflow.v2.Version}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listVersionsAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listVersions(
     request?: protos.google.cloud.dialogflow.v2.IListVersionsRequest,
     options?: CallOptions
@@ -858,35 +887,6 @@ export class VersionsClient {
       protos.google.cloud.dialogflow.v2.IVersion
     >
   ): void;
-  /**
-   * Returns the list of all versions of the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to list all versions from.
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent`
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By default 100 and
-   *   at most 1000.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Version]{@link google.cloud.dialogflow.v2.Version}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listVersionsAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listVersions(
     request?: protos.google.cloud.dialogflow.v2.IListVersionsRequest,
     optionsOrCallback?:
@@ -1007,11 +1007,8 @@ export class VersionsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listVersionsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2/versions.list_versions.js</caption>
+   * region_tag:dialogflow_v2_generated_Versions_ListVersions_async
    */
   listVersionsAsync(
     request?: protos.google.cloud.dialogflow.v2.IListVersionsRequest,
@@ -1025,7 +1022,6 @@ export class VersionsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listVersions'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/agents_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/agents_client.ts
index 9a450166778..025363ef272 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/agents_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/agents_client.ts
@@ -508,6 +508,25 @@ export class AgentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent to fetch is associated with.
+   *   Format: `projects/<Project ID>` or
+   *           `projects/<Project ID>/locations/<Location ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Agent]{@link google.cloud.dialogflow.v2beta1.Agent}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/agents.get_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_GetAgent_async
+   */
   getAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetAgentRequest,
     options?: CallOptions
@@ -539,25 +558,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent to fetch is associated with.
-   *   Format: `projects/<Project ID>` or
-   *           `projects/<Project ID>/locations/<Location ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Agent]{@link google.cloud.dialogflow.v2beta1.Agent}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getAgent(request);
-   */
   getAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetAgentRequest,
     optionsOrCallback?:
@@ -601,6 +601,29 @@ export class AgentsClient {
     this.initialize();
     return this.innerApiCalls.getAgent(request, options, callback);
   }
+  /**
+   * Creates/updates the specified agent.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.Agent} request.agent
+   *   Required. The agent to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Optional. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Agent]{@link google.cloud.dialogflow.v2beta1.Agent}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/agents.set_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_SetAgent_async
+   */
   setAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.ISetAgentRequest,
     options?: CallOptions
@@ -632,29 +655,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates/updates the specified agent.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.Agent} request.agent
-   *   Required. The agent to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Optional. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Agent]{@link google.cloud.dialogflow.v2beta1.Agent}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.setAgent(request);
-   */
   setAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.ISetAgentRequest,
     optionsOrCallback?:
@@ -698,6 +698,25 @@ export class AgentsClient {
     this.initialize();
     return this.innerApiCalls.setAgent(request, options, callback);
   }
+  /**
+   * Deletes the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent to delete is associated with.
+   *   Format: `projects/<Project ID>` or
+   *           `projects/<Project ID>/locations/<Location ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/agents.delete_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_DeleteAgent_async
+   */
   deleteAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteAgentRequest,
     options?: CallOptions
@@ -729,25 +748,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent to delete is associated with.
-   *   Format: `projects/<Project ID>` or
-   *           `projects/<Project ID>/locations/<Location ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteAgent(request);
-   */
   deleteAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteAgentRequest,
     optionsOrCallback?:
@@ -791,6 +791,32 @@ export class AgentsClient {
     this.initialize();
     return this.innerApiCalls.deleteAgent(request, options, callback);
   }
+  /**
+   * Gets agent validation result. Agent validation is performed during
+   * training time and is updated automatically when training is completed.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent is associated with.
+   *   Format: `projects/<Project ID>` or
+   *           `projects/<Project ID>/locations/<Location ID>`.
+   * @param {string} [request.languageCode]
+   *   Optional. The language for which you want a validation result. If not
+   *   specified, the agent's default language is used. [Many
+   *   languages](https://cloud.google.com/dialogflow/docs/reference/language)
+   *   are supported. Note: languages must be enabled in the agent before they can
+   *   be used.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [ValidationResult]{@link google.cloud.dialogflow.v2beta1.ValidationResult}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/agents.get_validation_result.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_GetValidationResult_async
+   */
   getValidationResult(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetValidationResultRequest,
     options?: CallOptions
@@ -825,32 +851,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Gets agent validation result. Agent validation is performed during
-   * training time and is updated automatically when training is completed.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent is associated with.
-   *   Format: `projects/<Project ID>` or
-   *           `projects/<Project ID>/locations/<Location ID>`.
-   * @param {string} [request.languageCode]
-   *   Optional. The language for which you want a validation result. If not
-   *   specified, the agent's default language is used. [Many
-   *   languages](https://cloud.google.com/dialogflow/docs/reference/language)
-   *   are supported. Note: languages must be enabled in the agent before they can
-   *   be used.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [ValidationResult]{@link google.cloud.dialogflow.v2beta1.ValidationResult}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getValidationResult(request);
-   */
   getValidationResult(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetValidationResultRequest,
     optionsOrCallback?:
@@ -898,6 +898,40 @@ export class AgentsClient {
     return this.innerApiCalls.getValidationResult(request, options, callback);
   }
 
+  /**
+   * Trains the specified agent.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: An empty [Struct
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
+   * - `response`: An [Empty
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent to train is associated with.
+   *   Format: `projects/<Project ID>` or
+   *           `projects/<Project ID>/locations/<Location ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/agents.train_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_TrainAgent_async
+   */
   trainAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.ITrainAgentRequest,
     options?: CallOptions
@@ -934,41 +968,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Trains the specified agent.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: An empty [Struct
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
-   * - `response`: An [Empty
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent to train is associated with.
-   *   Format: `projects/<Project ID>` or
-   *           `projects/<Project ID>/locations/<Location ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.trainAgent(request);
-   * const [response] = await operation.promise();
-   */
   trainAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.ITrainAgentRequest,
     optionsOrCallback?:
@@ -1026,11 +1025,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkTrainAgentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/agents.train_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_TrainAgent_async
    */
   async checkTrainAgentProgress(
     name: string
@@ -1051,6 +1047,41 @@ export class AgentsClient {
       protos.google.protobuf.Struct
     >;
   }
+  /**
+   * Exports the specified agent to a ZIP file.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: An empty [Struct
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
+   * - `response`: {@link google.cloud.dialogflow.v2beta1.ExportAgentResponse|ExportAgentResponse}
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project that the agent to export is associated with.
+   *   Format: `projects/<Project ID>` or
+   *           `projects/<Project ID>/locations/<Location ID>`.
+   * @param {string} request.agentUri
+   *   Optional. The
+   *   [Google Cloud Storage](https://cloud.google.com/storage/docs/)
+   *   URI to export the agent to.
+   *   The format of this URI must be `gs://<bucket-name>/<object-name>`.
+   *   If left unspecified, the serialized agent is returned inline.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/agents.export_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_ExportAgent_async
+   */
   exportAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.IExportAgentRequest,
     options?: CallOptions
@@ -1087,42 +1118,6 @@ export class AgentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Exports the specified agent to a ZIP file.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/es/docs/how/long-running-operations).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: An empty [Struct
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
-   * - `response`: {@link google.cloud.dialogflow.v2beta1.ExportAgentResponse|ExportAgentResponse}
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project that the agent to export is associated with.
-   *   Format: `projects/<Project ID>` or
-   *           `projects/<Project ID>/locations/<Location ID>`.
-   * @param {string} request.agentUri
-   *   Optional. The
-   *   [Google Cloud Storage](https://cloud.google.com/storage/docs/)
-   *   URI to export the agent to.
-   *   The format of this URI must be `gs://<bucket-name>/<object-name>`.
-   *   If left unspecified, the serialized agent is returned inline.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.exportAgent(request);
-   * const [response] = await operation.promise();
-   */
   exportAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.IExportAgentRequest,
     optionsOrCallback?:
@@ -1180,11 +1175,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkExportAgentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/agents.export_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_ExportAgent_async
    */
   async checkExportAgentProgress(
     name: string
@@ -1208,42 +1200,6 @@ export class AgentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  importAgent(
-    request?: protos.google.cloud.dialogflow.v2beta1.IImportAgentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  importAgent(
-    request: protos.google.cloud.dialogflow.v2beta1.IImportAgentRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  importAgent(
-    request: protos.google.cloud.dialogflow.v2beta1.IImportAgentRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Imports the specified agent from a ZIP file.
    *
@@ -1291,10 +1247,45 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.importAgent(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/agents.import_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_ImportAgent_async
    */
+  importAgent(
+    request?: protos.google.cloud.dialogflow.v2beta1.IImportAgentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  importAgent(
+    request: protos.google.cloud.dialogflow.v2beta1.IImportAgentRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  importAgent(
+    request: protos.google.cloud.dialogflow.v2beta1.IImportAgentRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   importAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.IImportAgentRequest,
     optionsOrCallback?:
@@ -1352,11 +1343,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkImportAgentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/agents.import_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_ImportAgent_async
    */
   async checkImportAgentProgress(
     name: string
@@ -1377,42 +1365,6 @@ export class AgentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  restoreAgent(
-    request?: protos.google.cloud.dialogflow.v2beta1.IRestoreAgentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  restoreAgent(
-    request: protos.google.cloud.dialogflow.v2beta1.IRestoreAgentRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  restoreAgent(
-    request: protos.google.cloud.dialogflow.v2beta1.IRestoreAgentRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Restores the specified agent from a ZIP file.
    *
@@ -1459,10 +1411,45 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.restoreAgent(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/agents.restore_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_RestoreAgent_async
    */
+  restoreAgent(
+    request?: protos.google.cloud.dialogflow.v2beta1.IRestoreAgentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  restoreAgent(
+    request: protos.google.cloud.dialogflow.v2beta1.IRestoreAgentRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  restoreAgent(
+    request: protos.google.cloud.dialogflow.v2beta1.IRestoreAgentRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   restoreAgent(
     request?: protos.google.cloud.dialogflow.v2beta1.IRestoreAgentRequest,
     optionsOrCallback?:
@@ -1520,11 +1507,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkRestoreAgentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/agents.restore_agent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_RestoreAgent_async
    */
   async checkRestoreAgentProgress(
     name: string
@@ -1545,37 +1529,6 @@ export class AgentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  searchAgents(
-    request?: protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IAgent[],
-      protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.ISearchAgentsResponse
-    ]
-  >;
-  searchAgents(
-    request: protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.ISearchAgentsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IAgent
-    >
-  ): void;
-  searchAgents(
-    request: protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.ISearchAgentsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IAgent
-    >
-  ): void;
   /**
    * Returns the list of agents.
    * Since there is at most one conversational agent per project, this method is
@@ -1608,6 +1561,37 @@ export class AgentsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  searchAgents(
+    request?: protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IAgent[],
+      protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.ISearchAgentsResponse
+    ]
+  >;
+  searchAgents(
+    request: protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.ISearchAgentsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IAgent
+    >
+  ): void;
+  searchAgents(
+    request: protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.ISearchAgentsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IAgent
+    >
+  ): void;
   searchAgents(
     request?: protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
     optionsOrCallback?:
@@ -1724,11 +1708,8 @@ export class AgentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.searchAgentsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/agents.search_agents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Agents_SearchAgents_async
    */
   searchAgentsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.ISearchAgentsRequest,
@@ -1742,7 +1723,6 @@ export class AgentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['searchAgents'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/answer_records_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/answer_records_client.ts
index afc483abc86..045cbe32cac 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/answer_records_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/answer_records_client.ts
@@ -437,6 +437,27 @@ export class AnswerRecordsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Deprecated.
+   * Retrieves a specific answer record.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the answer record to retrieve.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/answerRecords/<Answer Record Id>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [AnswerRecord]{@link google.cloud.dialogflow.v2beta1.AnswerRecord}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/answer_records.get_answer_record.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_AnswerRecords_GetAnswerRecord_async
+   * @deprecated GetAnswerRecord is deprecated and may be removed in a future version.
+   */
   getAnswerRecord(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetAnswerRecordRequest,
     options?: CallOptions
@@ -471,27 +492,6 @@ export class AnswerRecordsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deprecated.
-   * Retrieves a specific answer record.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the answer record to retrieve.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/answerRecords/<Answer Record Id>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [AnswerRecord]{@link google.cloud.dialogflow.v2beta1.AnswerRecord}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getAnswerRecord(request);
-   * @deprecated GetAnswerRecord is deprecated and may be removed in a future version.
-   */
   getAnswerRecord(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetAnswerRecordRequest,
     optionsOrCallback?:
@@ -543,6 +543,25 @@ export class AnswerRecordsClient {
     );
     return this.innerApiCalls.getAnswerRecord(request, options, callback);
   }
+  /**
+   * Updates the specified answer record.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.AnswerRecord} request.answerRecord
+   *   Required. Answer record to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [AnswerRecord]{@link google.cloud.dialogflow.v2beta1.AnswerRecord}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/answer_records.update_answer_record.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_AnswerRecords_UpdateAnswerRecord_async
+   */
   updateAnswerRecord(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateAnswerRecordRequest,
     options?: CallOptions
@@ -577,25 +596,6 @@ export class AnswerRecordsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified answer record.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.AnswerRecord} request.answerRecord
-   *   Required. Answer record to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [AnswerRecord]{@link google.cloud.dialogflow.v2beta1.AnswerRecord}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateAnswerRecord(request);
-   */
   updateAnswerRecord(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateAnswerRecordRequest,
     optionsOrCallback?:
@@ -643,37 +643,6 @@ export class AnswerRecordsClient {
     return this.innerApiCalls.updateAnswerRecord(request, options, callback);
   }
 
-  listAnswerRecords(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IAnswerRecord[],
-      protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsResponse
-    ]
-  >;
-  listAnswerRecords(
-    request: protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IAnswerRecord
-    >
-  ): void;
-  listAnswerRecords(
-    request: protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IAnswerRecord
-    >
-  ): void;
   /**
    * Returns the list of all answer records in the specified project in reverse
    * chronological order.
@@ -706,6 +675,37 @@ export class AnswerRecordsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listAnswerRecords(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IAnswerRecord[],
+      protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsResponse
+    ]
+  >;
+  listAnswerRecords(
+    request: protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IAnswerRecord
+    >
+  ): void;
+  listAnswerRecords(
+    request: protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IAnswerRecord
+    >
+  ): void;
   listAnswerRecords(
     request?: protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
     optionsOrCallback?:
@@ -830,11 +830,8 @@ export class AnswerRecordsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listAnswerRecordsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/answer_records.list_answer_records.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_AnswerRecords_ListAnswerRecords_async
    */
   listAnswerRecordsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListAnswerRecordsRequest,
@@ -848,7 +845,6 @@ export class AnswerRecordsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listAnswerRecords'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/contexts_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/contexts_client.ts
index 43917f9b137..48be4e98662 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/contexts_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/contexts_client.ts
@@ -443,6 +443,36 @@ export class ContextsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified context.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the context. Supported formats:
+   *   - `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context
+   *     ID>`,
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
+   *     ID>/contexts/<Context ID>`,
+   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *     ID>/sessions/<Session ID>/contexts/<Context ID>`,
+   *   - `projects/<Project ID>/locations/<Location
+   *     ID>/agent/environments/<Environment ID>/users/<User ID>/sessions/<Session
+   *     ID>/contexts/<Context ID>`,
+   *
+   *   If `Location ID` is not specified we assume default 'us' location. If
+   *   `Environment ID` is not specified, we assume default 'draft' environment.
+   *   If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2beta1.Context}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/contexts.get_context.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Contexts_GetContext_async
+   */
   getContext(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetContextRequest,
     options?: CallOptions
@@ -474,36 +504,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified context.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the context. Supported formats:
-   *   - `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context
-   *     ID>`,
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
-   *     ID>/contexts/<Context ID>`,
-   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *     ID>/sessions/<Session ID>/contexts/<Context ID>`,
-   *   - `projects/<Project ID>/locations/<Location
-   *     ID>/agent/environments/<Environment ID>/users/<User ID>/sessions/<Session
-   *     ID>/contexts/<Context ID>`,
-   *
-   *   If `Location ID` is not specified we assume default 'us' location. If
-   *   `Environment ID` is not specified, we assume default 'draft' environment.
-   *   If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2beta1.Context}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getContext(request);
-   */
   getContext(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetContextRequest,
     optionsOrCallback?:
@@ -547,37 +547,6 @@ export class ContextsClient {
     this.initialize();
     return this.innerApiCalls.getContext(request, options, callback);
   }
-  createContext(
-    request?: protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IContext,
-      protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  createContext(
-    request: protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IContext,
-      | protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  createContext(
-    request: protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IContext,
-      | protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Creates a context.
    *
@@ -608,9 +577,40 @@ export class ContextsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.createContext(request);
+   * @example <caption>include:samples/generated/v2beta1/contexts.create_context.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Contexts_CreateContext_async
    */
+  createContext(
+    request?: protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IContext,
+      protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  createContext(
+    request: protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IContext,
+      | protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  createContext(
+    request: protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IContext,
+      | protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   createContext(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateContextRequest,
     optionsOrCallback?:
@@ -654,6 +654,25 @@ export class ContextsClient {
     this.initialize();
     return this.innerApiCalls.createContext(request, options, callback);
   }
+  /**
+   * Updates the specified context.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.Context} request.context
+   *   Required. The context to update.
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2beta1.Context}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/contexts.update_context.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Contexts_UpdateContext_async
+   */
   updateContext(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateContextRequest,
     options?: CallOptions
@@ -685,25 +704,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified context.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.Context} request.context
-   *   Required. The context to update.
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Context]{@link google.cloud.dialogflow.v2beta1.Context}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateContext(request);
-   */
   updateContext(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateContextRequest,
     optionsOrCallback?:
@@ -747,6 +747,36 @@ export class ContextsClient {
     this.initialize();
     return this.innerApiCalls.updateContext(request, options, callback);
   }
+  /**
+   * Deletes the specified context.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the context to delete. Supported formats:
+   *   - `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context
+   *     ID>`,
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
+   *     ID>/contexts/<Context ID>`,
+   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *     ID>/sessions/<Session ID>/contexts/<Context ID>`,
+   *   - `projects/<Project ID>/locations/<Location
+   *     ID>/agent/environments/<Environment ID>/users/<User ID>/sessions/<Session
+   *     ID>/contexts/<Context ID>`,
+   *
+   *   If `Location ID` is not specified we assume default 'us' location. If
+   *   `Environment ID` is not specified, we assume default 'draft' environment.
+   *   If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/contexts.delete_context.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Contexts_DeleteContext_async
+   */
   deleteContext(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteContextRequest,
     options?: CallOptions
@@ -778,36 +808,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified context.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the context to delete. Supported formats:
-   *   - `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context
-   *     ID>`,
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
-   *     ID>/contexts/<Context ID>`,
-   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *     ID>/sessions/<Session ID>/contexts/<Context ID>`,
-   *   - `projects/<Project ID>/locations/<Location
-   *     ID>/agent/environments/<Environment ID>/users/<User ID>/sessions/<Session
-   *     ID>/contexts/<Context ID>`,
-   *
-   *   If `Location ID` is not specified we assume default 'us' location. If
-   *   `Environment ID` is not specified, we assume default 'draft' environment.
-   *   If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteContext(request);
-   */
   deleteContext(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteContextRequest,
     optionsOrCallback?:
@@ -851,6 +851,35 @@ export class ContextsClient {
     this.initialize();
     return this.innerApiCalls.deleteContext(request, options, callback);
   }
+  /**
+   * Deletes all active contexts in the specified session.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the session to delete all contexts from. Supported formats:
+   *   - `projects/<Project ID>/agent/sessions/<Session ID>,
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
+   *     ID>`,
+   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *     ID>/sessions/<Session ID>`,
+   *   - `projects/<Project ID>/locations/<Location
+   *     ID>/agent/environments/<Environment ID>/users/<User ID>/sessions/<Session
+   *     ID>`,
+   *
+   *   If `Location ID` is not specified we assume default 'us' location. If
+   *   `Environment ID` is not specified we assume default 'draft' environment. If
+   *   `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/contexts.delete_all_contexts.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Contexts_DeleteAllContexts_async
+   */
   deleteAllContexts(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteAllContextsRequest,
     options?: CallOptions
@@ -885,35 +914,6 @@ export class ContextsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes all active contexts in the specified session.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the session to delete all contexts from. Supported formats:
-   *   - `projects/<Project ID>/agent/sessions/<Session ID>,
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
-   *     ID>`,
-   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *     ID>/sessions/<Session ID>`,
-   *   - `projects/<Project ID>/locations/<Location
-   *     ID>/agent/environments/<Environment ID>/users/<User ID>/sessions/<Session
-   *     ID>`,
-   *
-   *   If `Location ID` is not specified we assume default 'us' location. If
-   *   `Environment ID` is not specified we assume default 'draft' environment. If
-   *   `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteAllContexts(request);
-   */
   deleteAllContexts(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteAllContextsRequest,
     optionsOrCallback?:
@@ -961,37 +961,6 @@ export class ContextsClient {
     return this.innerApiCalls.deleteAllContexts(request, options, callback);
   }
 
-  listContexts(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IContext[],
-      protos.google.cloud.dialogflow.v2beta1.IListContextsRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListContextsResponse
-    ]
-  >;
-  listContexts(
-    request: protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListContextsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IContext
-    >
-  ): void;
-  listContexts(
-    request: protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListContextsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IContext
-    >
-  ): void;
   /**
    * Returns the list of all contexts in the specified session.
    *
@@ -1029,6 +998,37 @@ export class ContextsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listContexts(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IContext[],
+      protos.google.cloud.dialogflow.v2beta1.IListContextsRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListContextsResponse
+    ]
+  >;
+  listContexts(
+    request: protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListContextsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IContext
+    >
+  ): void;
+  listContexts(
+    request: protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListContextsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IContext
+    >
+  ): void;
   listContexts(
     request?: protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
     optionsOrCallback?:
@@ -1165,11 +1165,8 @@ export class ContextsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listContextsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/contexts.list_contexts.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Contexts_ListContexts_async
    */
   listContextsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListContextsRequest,
@@ -1183,7 +1180,6 @@ export class ContextsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listContexts'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/conversation_profiles_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/conversation_profiles_client.ts
index c7c0d0e55e6..743d03f29c9 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/conversation_profiles_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/conversation_profiles_client.ts
@@ -443,6 +443,25 @@ export class ConversationProfilesClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified conversation profile.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The resource name of the conversation profile.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversationProfiles/<Conversation Profile ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2beta1.ConversationProfile}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/conversation_profiles.get_conversation_profile.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_ConversationProfiles_GetConversationProfile_async
+   */
   getConversationProfile(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetConversationProfileRequest,
     options?: CallOptions
@@ -477,25 +496,6 @@ export class ConversationProfilesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified conversation profile.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The resource name of the conversation profile.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversationProfiles/<Conversation Profile ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2beta1.ConversationProfile}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getConversationProfile(request);
-   */
   getConversationProfile(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetConversationProfileRequest,
     optionsOrCallback?:
@@ -546,6 +546,30 @@ export class ConversationProfilesClient {
       callback
     );
   }
+  /**
+   * Creates a conversation profile in the specified project.
+   *
+   * {@link |ConversationProfile.CreateTime} and {@link |ConversationProfile.UpdateTime}
+   * aren't populated in the response. You can retrieve them via
+   * {@link google.cloud.dialogflow.v2beta1.ConversationProfiles.GetConversationProfile|GetConversationProfile} API.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project to create a conversation profile for.
+   *   Format: `projects/<Project ID>/locations/<Location ID>`.
+   * @param {google.cloud.dialogflow.v2beta1.ConversationProfile} request.conversationProfile
+   *   Required. The conversation profile to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2beta1.ConversationProfile}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/conversation_profiles.create_conversation_profile.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_ConversationProfiles_CreateConversationProfile_async
+   */
   createConversationProfile(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateConversationProfileRequest,
     options?: CallOptions
@@ -580,30 +604,6 @@ export class ConversationProfilesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a conversation profile in the specified project.
-   *
-   * {@link |ConversationProfile.CreateTime} and {@link |ConversationProfile.UpdateTime}
-   * aren't populated in the response. You can retrieve them via
-   * {@link google.cloud.dialogflow.v2beta1.ConversationProfiles.GetConversationProfile|GetConversationProfile} API.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project to create a conversation profile for.
-   *   Format: `projects/<Project ID>/locations/<Location ID>`.
-   * @param {google.cloud.dialogflow.v2beta1.ConversationProfile} request.conversationProfile
-   *   Required. The conversation profile to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2beta1.ConversationProfile}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createConversationProfile(request);
-   */
   createConversationProfile(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateConversationProfileRequest,
     optionsOrCallback?:
@@ -654,6 +654,29 @@ export class ConversationProfilesClient {
       callback
     );
   }
+  /**
+   * Updates the specified conversation profile.
+   *
+   * {@link |ConversationProfile.CreateTime} and {@link |ConversationProfile.UpdateTime}
+   * aren't populated in the response. You can retrieve them via
+   * {@link google.cloud.dialogflow.v2beta1.ConversationProfiles.GetConversationProfile|GetConversationProfile} API.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.ConversationProfile} request.conversationProfile
+   *   Required. The conversation profile to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields to update.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2beta1.ConversationProfile}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/conversation_profiles.update_conversation_profile.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_ConversationProfiles_UpdateConversationProfile_async
+   */
   updateConversationProfile(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateConversationProfileRequest,
     options?: CallOptions
@@ -688,29 +711,6 @@ export class ConversationProfilesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified conversation profile.
-   *
-   * {@link |ConversationProfile.CreateTime} and {@link |ConversationProfile.UpdateTime}
-   * aren't populated in the response. You can retrieve them via
-   * {@link google.cloud.dialogflow.v2beta1.ConversationProfiles.GetConversationProfile|GetConversationProfile} API.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.ConversationProfile} request.conversationProfile
-   *   Required. The conversation profile to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields to update.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [ConversationProfile]{@link google.cloud.dialogflow.v2beta1.ConversationProfile}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateConversationProfile(request);
-   */
   updateConversationProfile(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateConversationProfileRequest,
     optionsOrCallback?:
@@ -761,6 +761,25 @@ export class ConversationProfilesClient {
       callback
     );
   }
+  /**
+   * Deletes the specified conversation profile.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the conversation profile to delete.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversationProfiles/<Conversation Profile ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/conversation_profiles.delete_conversation_profile.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_ConversationProfiles_DeleteConversationProfile_async
+   */
   deleteConversationProfile(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteConversationProfileRequest,
     options?: CallOptions
@@ -795,25 +814,6 @@ export class ConversationProfilesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified conversation profile.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the conversation profile to delete.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversationProfiles/<Conversation Profile ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteConversationProfile(request);
-   */
   deleteConversationProfile(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteConversationProfileRequest,
     optionsOrCallback?:
@@ -865,6 +865,32 @@ export class ConversationProfilesClient {
     );
   }
 
+  /**
+   * Returns the list of all conversation profiles in the specified project.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project to list all conversation profiles from.
+   *   Format: `projects/<Project ID>/locations/<Location ID>`.
+   * @param {number} request.pageSize
+   *   The maximum number of items to return in a single page. By
+   *   default 100 and at most 1000.
+   * @param {string} request.pageToken
+   *   The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [ConversationProfile]{@link google.cloud.dialogflow.v2beta1.ConversationProfile}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listConversationProfilesAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listConversationProfiles(
     request?: protos.google.cloud.dialogflow.v2beta1.IListConversationProfilesRequest,
     options?: CallOptions
@@ -896,32 +922,6 @@ export class ConversationProfilesClient {
       protos.google.cloud.dialogflow.v2beta1.IConversationProfile
     >
   ): void;
-  /**
-   * Returns the list of all conversation profiles in the specified project.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project to list all conversation profiles from.
-   *   Format: `projects/<Project ID>/locations/<Location ID>`.
-   * @param {number} request.pageSize
-   *   The maximum number of items to return in a single page. By
-   *   default 100 and at most 1000.
-   * @param {string} request.pageToken
-   *   The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [ConversationProfile]{@link google.cloud.dialogflow.v2beta1.ConversationProfile}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listConversationProfilesAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listConversationProfiles(
     request?: protos.google.cloud.dialogflow.v2beta1.IListConversationProfilesRequest,
     optionsOrCallback?:
@@ -1040,11 +1040,8 @@ export class ConversationProfilesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listConversationProfilesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/conversation_profiles.list_conversation_profiles.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_ConversationProfiles_ListConversationProfiles_async
    */
   listConversationProfilesAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListConversationProfilesRequest,
@@ -1058,7 +1055,6 @@ export class ConversationProfilesClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listConversationProfiles'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/conversations_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/conversations_client.ts
index 847a37c7d37..08c70f2062f 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/conversations_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/conversations_client.ts
@@ -445,40 +445,6 @@ export class ConversationsClient {
   // -------------------
   // -- Service calls --
   // -------------------
-  createConversation(
-    request?: protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IConversation,
-      (
-        | protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest
-        | undefined
-      ),
-      {} | undefined
-    ]
-  >;
-  createConversation(
-    request: protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IConversation,
-      | protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  createConversation(
-    request: protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IConversation,
-      | protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Creates a new conversation. Conversations are auto-completed after 24
    * hours.
@@ -524,9 +490,43 @@ export class ConversationsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.createConversation(request);
+   * @example <caption>include:samples/generated/v2beta1/conversations.create_conversation.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Conversations_CreateConversation_async
    */
+  createConversation(
+    request?: protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IConversation,
+      (
+        | protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest
+        | undefined
+      ),
+      {} | undefined
+    ]
+  >;
+  createConversation(
+    request: protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IConversation,
+      | protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  createConversation(
+    request: protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IConversation,
+      | protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   createConversation(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateConversationRequest,
     optionsOrCallback?:
@@ -573,6 +573,25 @@ export class ConversationsClient {
     this.initialize();
     return this.innerApiCalls.createConversation(request, options, callback);
   }
+  /**
+   * Retrieves the specific conversation.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the conversation. Format:
+   *   `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
+   *   ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Conversation]{@link google.cloud.dialogflow.v2beta1.Conversation}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/conversations.get_conversation.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Conversations_GetConversation_async
+   */
   getConversation(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetConversationRequest,
     options?: CallOptions
@@ -607,25 +626,6 @@ export class ConversationsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specific conversation.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the conversation. Format:
-   *   `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
-   *   ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Conversation]{@link google.cloud.dialogflow.v2beta1.Conversation}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getConversation(request);
-   */
   getConversation(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetConversationRequest,
     optionsOrCallback?:
@@ -672,6 +672,26 @@ export class ConversationsClient {
     this.initialize();
     return this.innerApiCalls.getConversation(request, options, callback);
   }
+  /**
+   * Completes the specified conversation. Finished conversations are purged
+   * from the database after 30 days.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. Resource identifier of the conversation to close.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Conversation]{@link google.cloud.dialogflow.v2beta1.Conversation}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/conversations.complete_conversation.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Conversations_CompleteConversation_async
+   */
   completeConversation(
     request?: protos.google.cloud.dialogflow.v2beta1.ICompleteConversationRequest,
     options?: CallOptions
@@ -706,26 +726,6 @@ export class ConversationsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Completes the specified conversation. Finished conversations are purged
-   * from the database after 30 days.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. Resource identifier of the conversation to close.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Conversation]{@link google.cloud.dialogflow.v2beta1.Conversation}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.completeConversation(request);
-   */
   completeConversation(
     request?: protos.google.cloud.dialogflow.v2beta1.ICompleteConversationRequest,
     optionsOrCallback?:
@@ -772,6 +772,30 @@ export class ConversationsClient {
     this.initialize();
     return this.innerApiCalls.completeConversation(request, options, callback);
   }
+  /**
+   * Batch ingests messages to conversation. Customers can use this RPC to
+   * ingest historical messages to conversation.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. Resource identifier of the conversation to create message.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>`.
+   * @param {number[]} request.requests
+   *   Required. A maximum of 1000 Messages can be created in a batch.
+   *   {@link |CreateMessageRequest.message.send_time} is required. All created
+   *   messages will have identical {@link google.cloud.dialogflow.v2beta1.Message.create_time|Message.create_time}.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [BatchCreateMessagesResponse]{@link google.cloud.dialogflow.v2beta1.BatchCreateMessagesResponse}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/conversations.batch_create_messages.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Conversations_BatchCreateMessages_async
+   */
   batchCreateMessages(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchCreateMessagesRequest,
     options?: CallOptions
@@ -806,30 +830,6 @@ export class ConversationsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Batch ingests messages to conversation. Customers can use this RPC to
-   * ingest historical messages to conversation.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. Resource identifier of the conversation to create message.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>`.
-   * @param {number[]} request.requests
-   *   Required. A maximum of 1000 Messages can be created in a batch.
-   *   {@link |CreateMessageRequest.message.send_time} is required. All created
-   *   messages will have identical {@link google.cloud.dialogflow.v2beta1.Message.create_time|Message.create_time}.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [BatchCreateMessagesResponse]{@link google.cloud.dialogflow.v2beta1.BatchCreateMessagesResponse}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.batchCreateMessages(request);
-   */
   batchCreateMessages(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchCreateMessagesRequest,
     optionsOrCallback?:
@@ -877,37 +877,6 @@ export class ConversationsClient {
     return this.innerApiCalls.batchCreateMessages(request, options, callback);
   }
 
-  listConversations(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IConversation[],
-      protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListConversationsResponse
-    ]
-  >;
-  listConversations(
-    request: protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListConversationsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IConversation
-    >
-  ): void;
-  listConversations(
-    request: protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListConversationsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IConversation
-    >
-  ): void;
   /**
    * Returns the list of all conversations in the specified project.
    *
@@ -952,6 +921,37 @@ export class ConversationsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listConversations(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IConversation[],
+      protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListConversationsResponse
+    ]
+  >;
+  listConversations(
+    request: protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListConversationsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IConversation
+    >
+  ): void;
+  listConversations(
+    request: protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListConversationsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IConversation
+    >
+  ): void;
   listConversations(
     request?: protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
     optionsOrCallback?:
@@ -1102,11 +1102,8 @@ export class ConversationsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listConversationsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/conversations.list_conversations.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Conversations_ListConversations_async
    */
   listConversationsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListConversationsRequest,
@@ -1120,7 +1117,6 @@ export class ConversationsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listConversations'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
@@ -1130,37 +1126,6 @@ export class ConversationsClient {
       callSettings
     ) as AsyncIterable<protos.google.cloud.dialogflow.v2beta1.IConversation>;
   }
-  listMessages(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IMessage[],
-      protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListMessagesResponse
-    ]
-  >;
-  listMessages(
-    request: protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListMessagesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IMessage
-    >
-  ): void;
-  listMessages(
-    request: protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListMessagesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IMessage
-    >
-  ): void;
   /**
    * Lists messages that belong to a given conversation.
    * `messages` are ordered by `create_time` in descending order. To fetch
@@ -1201,6 +1166,37 @@ export class ConversationsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listMessages(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IMessage[],
+      protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListMessagesResponse
+    ]
+  >;
+  listMessages(
+    request: protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListMessagesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IMessage
+    >
+  ): void;
+  listMessages(
+    request: protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListMessagesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IMessage
+    >
+  ): void;
   listMessages(
     request?: protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
     optionsOrCallback?:
@@ -1335,11 +1331,8 @@ export class ConversationsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listMessagesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/conversations.list_messages.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Conversations_ListMessages_async
    */
   listMessagesAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListMessagesRequest,
@@ -1353,7 +1346,6 @@ export class ConversationsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listMessages'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/documents_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/documents_client.ts
index d6cc7a45d53..4937a355f96 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/documents_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/documents_client.ts
@@ -517,6 +517,28 @@ export class DocumentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified document.
+   *
+   * Note: The `projects.agent.knowledgeBases.documents` resource is deprecated;
+   * only use `projects.knowledgeBases.documents`.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the document to retrieve.
+   *   Format `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Document]{@link google.cloud.dialogflow.v2beta1.Document}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/documents.get_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_GetDocument_async
+   */
   getDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetDocumentRequest,
     options?: CallOptions
@@ -548,28 +570,6 @@ export class DocumentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified document.
-   *
-   * Note: The `projects.agent.knowledgeBases.documents` resource is deprecated;
-   * only use `projects.knowledgeBases.documents`.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the document to retrieve.
-   *   Format `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Document]{@link google.cloud.dialogflow.v2beta1.Document}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getDocument(request);
-   */
   getDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetDocumentRequest,
     optionsOrCallback?:
@@ -614,6 +614,42 @@ export class DocumentsClient {
     return this.innerApiCalls.getDocument(request, options, callback);
   }
 
+  /**
+   * Creates a new document.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: {@link google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
+   * - `response`: {@link google.cloud.dialogflow.v2beta1.Document|Document}
+   *
+   * Note: The `projects.agent.knowledgeBases.documents` resource is deprecated;
+   * only use `projects.knowledgeBases.documents`.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The knowledge base to create a document for.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>`.
+   * @param {google.cloud.dialogflow.v2beta1.Document} request.document
+   *   Required. The document to create.
+   * @param {boolean} request.importGcsCustomMetadata
+   *   Whether to import custom metadata from Google Cloud Storage.
+   *   Only valid when the document source is Google Cloud Storage URI.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/documents.create_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_CreateDocument_async
+   */
   createDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateDocumentRequest,
     options?: CallOptions
@@ -650,43 +686,6 @@ export class DocumentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a new document.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: {@link google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
-   * - `response`: {@link google.cloud.dialogflow.v2beta1.Document|Document}
-   *
-   * Note: The `projects.agent.knowledgeBases.documents` resource is deprecated;
-   * only use `projects.knowledgeBases.documents`.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The knowledge base to create a document for.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>`.
-   * @param {google.cloud.dialogflow.v2beta1.Document} request.document
-   *   Required. The document to create.
-   * @param {boolean} request.importGcsCustomMetadata
-   *   Whether to import custom metadata from Google Cloud Storage.
-   *   Only valid when the document source is Google Cloud Storage URI.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.createDocument(request);
-   * const [response] = await operation.promise();
-   */
   createDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateDocumentRequest,
     optionsOrCallback?:
@@ -744,11 +743,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkCreateDocumentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/documents.create_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_CreateDocument_async
    */
   async checkCreateDocumentProgress(
     name: string
@@ -772,42 +768,6 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata
     >;
   }
-  importDocuments(
-    request?: protos.google.cloud.dialogflow.v2beta1.IImportDocumentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IImportDocumentsResponse,
-        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  importDocuments(
-    request: protos.google.cloud.dialogflow.v2beta1.IImportDocumentsRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IImportDocumentsResponse,
-        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  importDocuments(
-    request: protos.google.cloud.dialogflow.v2beta1.IImportDocumentsRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IImportDocumentsResponse,
-        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Create documents by importing data from external sources.
    * Dialogflow supports up to 350 documents in each request. If you try to
@@ -847,10 +807,45 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.importDocuments(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/documents.import_documents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_ImportDocuments_async
    */
+  importDocuments(
+    request?: protos.google.cloud.dialogflow.v2beta1.IImportDocumentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IImportDocumentsResponse,
+        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  importDocuments(
+    request: protos.google.cloud.dialogflow.v2beta1.IImportDocumentsRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IImportDocumentsResponse,
+        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  importDocuments(
+    request: protos.google.cloud.dialogflow.v2beta1.IImportDocumentsRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IImportDocumentsResponse,
+        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   importDocuments(
     request?: protos.google.cloud.dialogflow.v2beta1.IImportDocumentsRequest,
     optionsOrCallback?:
@@ -908,11 +903,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkImportDocumentsProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/documents.import_documents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_ImportDocuments_async
    */
   async checkImportDocumentsProgress(
     name: string
@@ -936,6 +928,38 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata
     >;
   }
+  /**
+   * Deletes the specified document.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: {@link google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
+   * - `response`: An [Empty
+   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
+   *
+   * Note: The `projects.agent.knowledgeBases.documents` resource is deprecated;
+   * only use `projects.knowledgeBases.documents`.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the document to delete.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/documents.delete_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_DeleteDocument_async
+   */
   deleteDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteDocumentRequest,
     options?: CallOptions
@@ -972,39 +996,6 @@ export class DocumentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified document.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: {@link google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
-   * - `response`: An [Empty
-   *   message](https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#empty)
-   *
-   * Note: The `projects.agent.knowledgeBases.documents` resource is deprecated;
-   * only use `projects.knowledgeBases.documents`.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the document to delete.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.deleteDocument(request);
-   * const [response] = await operation.promise();
-   */
   deleteDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteDocumentRequest,
     optionsOrCallback?:
@@ -1062,11 +1053,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkDeleteDocumentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/documents.delete_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_DeleteDocument_async
    */
   async checkDeleteDocumentProgress(
     name: string
@@ -1090,6 +1078,39 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata
     >;
   }
+  /**
+   * Updates the specified document.
+   *
+   * This method is a [long-running
+   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
+   * The returned `Operation` type has the following method-specific fields:
+   *
+   * - `metadata`: {@link google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
+   * - `response`: {@link google.cloud.dialogflow.v2beta1.Document|Document}
+   *
+   * Note: The `projects.agent.knowledgeBases.documents` resource is deprecated;
+   * only use `projects.knowledgeBases.documents`.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.Document} request.document
+   *   Required. The document to update.
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. Not specified means `update all`.
+   *   Currently, only `display_name` can be updated, an InvalidArgument will be
+   *   returned for attempting to update other fields.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing
+   *   a long running operation. Its `promise()` method returns a promise
+   *   you can `await` for.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/documents.update_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_UpdateDocument_async
+   */
   updateDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateDocumentRequest,
     options?: CallOptions
@@ -1126,40 +1147,6 @@ export class DocumentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified document.
-   *
-   * This method is a [long-running
-   * operation](https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
-   * The returned `Operation` type has the following method-specific fields:
-   *
-   * - `metadata`: {@link google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata|KnowledgeOperationMetadata}
-   * - `response`: {@link google.cloud.dialogflow.v2beta1.Document|Document}
-   *
-   * Note: The `projects.agent.knowledgeBases.documents` resource is deprecated;
-   * only use `projects.knowledgeBases.documents`.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.Document} request.document
-   *   Required. The document to update.
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. Not specified means `update all`.
-   *   Currently, only `display_name` can be updated, an InvalidArgument will be
-   *   returned for attempting to update other fields.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing
-   *   a long running operation. Its `promise()` method returns a promise
-   *   you can `await` for.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
-   *   for more details and examples.
-   * @example
-   * const [operation] = await client.updateDocument(request);
-   * const [response] = await operation.promise();
-   */
   updateDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateDocumentRequest,
     optionsOrCallback?:
@@ -1217,11 +1204,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkUpdateDocumentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/documents.update_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_UpdateDocument_async
    */
   async checkUpdateDocumentProgress(
     name: string
@@ -1245,42 +1229,6 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata
     >;
   }
-  reloadDocument(
-    request?: protos.google.cloud.dialogflow.v2beta1.IReloadDocumentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IDocument,
-        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  reloadDocument(
-    request: protos.google.cloud.dialogflow.v2beta1.IReloadDocumentRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IDocument,
-        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  reloadDocument(
-    request: protos.google.cloud.dialogflow.v2beta1.IReloadDocumentRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IDocument,
-        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Reloads the specified document from its specified source, content_uri or
    * content. The previously loaded content of the document will be deleted.
@@ -1321,10 +1269,45 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.reloadDocument(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/documents.reload_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_ReloadDocument_async
    */
+  reloadDocument(
+    request?: protos.google.cloud.dialogflow.v2beta1.IReloadDocumentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IDocument,
+        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  reloadDocument(
+    request: protos.google.cloud.dialogflow.v2beta1.IReloadDocumentRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IDocument,
+        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  reloadDocument(
+    request: protos.google.cloud.dialogflow.v2beta1.IReloadDocumentRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IDocument,
+        protos.google.cloud.dialogflow.v2beta1.IKnowledgeOperationMetadata
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   reloadDocument(
     request?: protos.google.cloud.dialogflow.v2beta1.IReloadDocumentRequest,
     optionsOrCallback?:
@@ -1382,11 +1365,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkReloadDocumentProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/documents.reload_document.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_ReloadDocument_async
    */
   async checkReloadDocumentProgress(
     name: string
@@ -1410,37 +1390,6 @@ export class DocumentsClient {
       protos.google.cloud.dialogflow.v2beta1.KnowledgeOperationMetadata
     >;
   }
-  listDocuments(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IDocument[],
-      protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListDocumentsResponse
-    ]
-  >;
-  listDocuments(
-    request: protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListDocumentsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IDocument
-    >
-  ): void;
-  listDocuments(
-    request: protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListDocumentsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IDocument
-    >
-  ): void;
   /**
    * Returns the list of all documents of the knowledge base.
    *
@@ -1493,6 +1442,37 @@ export class DocumentsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listDocuments(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IDocument[],
+      protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListDocumentsResponse
+    ]
+  >;
+  listDocuments(
+    request: protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListDocumentsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IDocument
+    >
+  ): void;
+  listDocuments(
+    request: protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListDocumentsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IDocument
+    >
+  ): void;
   listDocuments(
     request?: protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
     optionsOrCallback?:
@@ -1653,11 +1633,8 @@ export class DocumentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listDocumentsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/documents.list_documents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Documents_ListDocuments_async
    */
   listDocumentsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListDocumentsRequest,
@@ -1671,7 +1648,6 @@ export class DocumentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listDocuments'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/entity_types_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/entity_types_client.ts
index d712d68fc78..fd09e9273e0 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/entity_types_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/entity_types_client.ts
@@ -528,6 +528,33 @@ export class EntityTypesClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified entity type.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the entity type.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent/entityTypes/<Entity Type ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/entityTypes/<Entity
+   *     Type ID>`
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2beta1.EntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/entity_types.get_entity_type.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_GetEntityType_async
+   */
   getEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetEntityTypeRequest,
     options?: CallOptions
@@ -559,33 +586,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified entity type.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the entity type.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent/entityTypes/<Entity Type ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/entityTypes/<Entity
-   *     Type ID>`
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2beta1.EntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getEntityType(request);
-   */
   getEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetEntityTypeRequest,
     optionsOrCallback?:
@@ -629,6 +629,38 @@ export class EntityTypesClient {
     this.initialize();
     return this.innerApiCalls.getEntityType(request, options, callback);
   }
+  /**
+   * Creates an entity type in the specified agent.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to create a entity type for.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent`
+   * @param {google.cloud.dialogflow.v2beta1.EntityType} request.entityType
+   *   Required. The entity type to create.
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2beta1.EntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/entity_types.create_entity_type.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_CreateEntityType_async
+   */
   createEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateEntityTypeRequest,
     options?: CallOptions
@@ -663,38 +695,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates an entity type in the specified agent.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to create a entity type for.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent`
-   * @param {google.cloud.dialogflow.v2beta1.EntityType} request.entityType
-   *   Required. The entity type to create.
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2beta1.EntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createEntityType(request);
-   */
   createEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateEntityTypeRequest,
     optionsOrCallback?:
@@ -741,6 +741,35 @@ export class EntityTypesClient {
     this.initialize();
     return this.innerApiCalls.createEntityType(request, options, callback);
   }
+  /**
+   * Updates the specified entity type.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.EntityType} request.entityType
+   *   Required. The entity type to update.
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2beta1.EntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/entity_types.update_entity_type.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_UpdateEntityType_async
+   */
   updateEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateEntityTypeRequest,
     options?: CallOptions
@@ -775,35 +804,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified entity type.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.EntityType} request.entityType
-   *   Required. The entity type to update.
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [EntityType]{@link google.cloud.dialogflow.v2beta1.EntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateEntityType(request);
-   */
   updateEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateEntityTypeRequest,
     optionsOrCallback?:
@@ -850,6 +850,31 @@ export class EntityTypesClient {
     this.initialize();
     return this.innerApiCalls.updateEntityType(request, options, callback);
   }
+  /**
+   * Deletes the specified entity type.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the entity type to delete.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent/entityTypes/<Entity Type ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/entityTypes/<Entity
+   *     Type ID>`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/entity_types.delete_entity_type.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_DeleteEntityType_async
+   */
   deleteEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteEntityTypeRequest,
     options?: CallOptions
@@ -884,31 +909,6 @@ export class EntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified entity type.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the entity type to delete.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent/entityTypes/<Entity Type ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/entityTypes/<Entity
-   *     Type ID>`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteEntityType(request);
-   */
   deleteEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteEntityTypeRequest,
     optionsOrCallback?:
@@ -956,42 +956,6 @@ export class EntityTypesClient {
     return this.innerApiCalls.deleteEntityType(request, options, callback);
   }
 
-  batchUpdateEntityTypes(
-    request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchUpdateEntityTypes(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchUpdateEntityTypes(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Updates/Creates multiple entity types in the specified agent.
    *
@@ -1038,10 +1002,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchUpdateEntityTypes(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_update_entity_types.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchUpdateEntityTypes_async
    */
+  batchUpdateEntityTypes(
+    request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchUpdateEntityTypes(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchUpdateEntityTypes(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchUpdateEntityTypes(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntityTypesRequest,
     optionsOrCallback?:
@@ -1103,11 +1102,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchUpdateEntityTypesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_update_entity_types.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchUpdateEntityTypes_async
    */
   async checkBatchUpdateEntityTypesProgress(
     name: string
@@ -1131,42 +1127,6 @@ export class EntityTypesClient {
       protos.google.protobuf.Struct
     >;
   }
-  batchDeleteEntityTypes(
-    request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntityTypesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchDeleteEntityTypes(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntityTypesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchDeleteEntityTypes(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntityTypesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Deletes entity types in the specified agent.
    *
@@ -1202,10 +1162,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchDeleteEntityTypes(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_delete_entity_types.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchDeleteEntityTypes_async
    */
+  batchDeleteEntityTypes(
+    request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntityTypesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchDeleteEntityTypes(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntityTypesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchDeleteEntityTypes(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntityTypesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchDeleteEntityTypes(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntityTypesRequest,
     optionsOrCallback?:
@@ -1267,11 +1262,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchDeleteEntityTypesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_delete_entity_types.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchDeleteEntityTypes_async
    */
   async checkBatchDeleteEntityTypesProgress(
     name: string
@@ -1279,55 +1271,19 @@ export class EntityTypesClient {
     LROperation<protos.google.protobuf.Empty, protos.google.protobuf.Struct>
   > {
     const request = new operationsProtos.google.longrunning.GetOperationRequest(
-      {name}
-    );
-    const [operation] = await this.operationsClient.getOperation(request);
-    const decodeOperation = new gax.Operation(
-      operation,
-      this.descriptors.longrunning.batchDeleteEntityTypes,
-      gax.createDefaultBackoffSettings()
-    );
-    return decodeOperation as LROperation<
-      protos.google.protobuf.Empty,
-      protos.google.protobuf.Struct
-    >;
-  }
-  batchCreateEntities(
-    request?: protos.google.cloud.dialogflow.v2beta1.IBatchCreateEntitiesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchCreateEntities(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchCreateEntitiesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchCreateEntities(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchCreateEntitiesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
+      {name}
+    );
+    const [operation] = await this.operationsClient.getOperation(request);
+    const decodeOperation = new gax.Operation(
+      operation,
+      this.descriptors.longrunning.batchDeleteEntityTypes,
+      gax.createDefaultBackoffSettings()
+    );
+    return decodeOperation as LROperation<
+      protos.google.protobuf.Empty,
+      protos.google.protobuf.Struct
+    >;
+  }
   /**
    * Creates multiple new entities in the specified entity type.
    *
@@ -1369,10 +1325,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchCreateEntities(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_create_entities.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchCreateEntities_async
    */
+  batchCreateEntities(
+    request?: protos.google.cloud.dialogflow.v2beta1.IBatchCreateEntitiesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchCreateEntities(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchCreateEntitiesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchCreateEntities(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchCreateEntitiesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchCreateEntities(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchCreateEntitiesRequest,
     optionsOrCallback?:
@@ -1430,11 +1421,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchCreateEntitiesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_create_entities.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchCreateEntities_async
    */
   async checkBatchCreateEntitiesProgress(
     name: string
@@ -1455,42 +1443,6 @@ export class EntityTypesClient {
       protos.google.protobuf.Struct
     >;
   }
-  batchUpdateEntities(
-    request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntitiesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchUpdateEntities(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntitiesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchUpdateEntities(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntitiesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Updates or creates multiple entities in the specified entity type. This
    * method does not affect entities in the entity type that aren't explicitly
@@ -1536,10 +1488,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchUpdateEntities(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_update_entities.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchUpdateEntities_async
    */
+  batchUpdateEntities(
+    request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntitiesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchUpdateEntities(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntitiesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchUpdateEntities(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntitiesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchUpdateEntities(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateEntitiesRequest,
     optionsOrCallback?:
@@ -1597,11 +1584,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchUpdateEntitiesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_update_entities.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchUpdateEntities_async
    */
   async checkBatchUpdateEntitiesProgress(
     name: string
@@ -1622,42 +1606,6 @@ export class EntityTypesClient {
       protos.google.protobuf.Struct
     >;
   }
-  batchDeleteEntities(
-    request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntitiesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchDeleteEntities(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntitiesRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchDeleteEntities(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntitiesRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Deletes entities in the specified entity type.
    *
@@ -1701,10 +1649,45 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchDeleteEntities(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_delete_entities.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchDeleteEntities_async
    */
+  batchDeleteEntities(
+    request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntitiesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchDeleteEntities(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntitiesRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchDeleteEntities(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntitiesRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchDeleteEntities(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteEntitiesRequest,
     optionsOrCallback?:
@@ -1762,11 +1745,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchDeleteEntitiesProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/entity_types.batch_delete_entities.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_BatchDeleteEntities_async
    */
   async checkBatchDeleteEntitiesProgress(
     name: string
@@ -1787,37 +1767,6 @@ export class EntityTypesClient {
       protos.google.protobuf.Struct
     >;
   }
-  listEntityTypes(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IEntityType[],
-      protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListEntityTypesResponse
-    ]
-  >;
-  listEntityTypes(
-    request: protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListEntityTypesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IEntityType
-    >
-  ): void;
-  listEntityTypes(
-    request: protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListEntityTypesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IEntityType
-    >
-  ): void;
   /**
    * Returns the list of all entity types in the specified agent.
    *
@@ -1852,6 +1801,37 @@ export class EntityTypesClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listEntityTypes(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IEntityType[],
+      protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListEntityTypesResponse
+    ]
+  >;
+  listEntityTypes(
+    request: protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListEntityTypesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IEntityType
+    >
+  ): void;
+  listEntityTypes(
+    request: protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListEntityTypesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IEntityType
+    >
+  ): void;
   listEntityTypes(
     request?: protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
     optionsOrCallback?:
@@ -1982,11 +1962,8 @@ export class EntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listEntityTypesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/entity_types.list_entity_types.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_EntityTypes_ListEntityTypes_async
    */
   listEntityTypesAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListEntityTypesRequest,
@@ -2000,7 +1977,6 @@ export class EntityTypesClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listEntityTypes'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/environments_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/environments_client.ts
index 669a6caf063..ba5095042cd 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/environments_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/environments_client.ts
@@ -445,6 +445,27 @@ export class EnvironmentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified agent environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the environment.
+   *   Supported formats:
+   *   - `projects/<Project Number / ID>/agent/environments/<Environment ID>`
+   *   - `projects/<Project Number / ID>/locations/<Location
+   *     ID>/agent/environments/<Environment ID>`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2beta1.Environment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/environments.get_environment.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Environments_GetEnvironment_async
+   */
   getEnvironment(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetEnvironmentRequest,
     options?: CallOptions
@@ -476,27 +497,6 @@ export class EnvironmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified agent environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the environment.
-   *   Supported formats:
-   *   - `projects/<Project Number / ID>/agent/environments/<Environment ID>`
-   *   - `projects/<Project Number / ID>/locations/<Location
-   *     ID>/agent/environments/<Environment ID>`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2beta1.Environment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getEnvironment(request);
-   */
   getEnvironment(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetEnvironmentRequest,
     optionsOrCallback?:
@@ -540,6 +540,30 @@ export class EnvironmentsClient {
     this.initialize();
     return this.innerApiCalls.getEnvironment(request, options, callback);
   }
+  /**
+   * Creates an agent environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to create an environment for.
+   *   Supported formats:
+   *   - `projects/<Project Number / ID>/agent`
+   *   - `projects/<Project Number / ID>/locations/<Location ID>/agent`
+   * @param {google.cloud.dialogflow.v2beta1.Environment} request.environment
+   *   Required. The environment to create.
+   * @param {string} request.environmentId
+   *   Required. The unique id of the new environment.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2beta1.Environment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/environments.create_environment.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Environments_CreateEnvironment_async
+   */
   createEnvironment(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateEnvironmentRequest,
     options?: CallOptions
@@ -574,30 +598,6 @@ export class EnvironmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates an agent environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to create an environment for.
-   *   Supported formats:
-   *   - `projects/<Project Number / ID>/agent`
-   *   - `projects/<Project Number / ID>/locations/<Location ID>/agent`
-   * @param {google.cloud.dialogflow.v2beta1.Environment} request.environment
-   *   Required. The environment to create.
-   * @param {string} request.environmentId
-   *   Required. The unique id of the new environment.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2beta1.Environment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createEnvironment(request);
-   */
   createEnvironment(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateEnvironmentRequest,
     optionsOrCallback?:
@@ -644,6 +644,41 @@ export class EnvironmentsClient {
     this.initialize();
     return this.innerApiCalls.createEnvironment(request, options, callback);
   }
+  /**
+   * Updates the specified agent environment.
+   *
+   * This method allows you to deploy new agent versions into the environment.
+   * When an environment is pointed to a new agent version by setting
+   * `environment.agent_version`, the environment is temporarily set to the
+   * `LOADING` state. During that time, the environment keeps on serving the
+   * previous version of the agent. After the new agent version is done loading,
+   * the environment is set back to the `RUNNING` state.
+   * You can use "-" as Environment ID in environment name to update version
+   * in "draft" environment. WARNING: this will negate all recent changes to
+   * draft and can't be undone. You may want to save the draft to a version
+   * before calling this function.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.Environment} request.environment
+   *   Required. The environment to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields get updated.
+   * @param {boolean} [request.allowLoadToDraftAndDiscardChanges]
+   *   Optional. This field is used to prevent accidental overwrite of the draft
+   *   environment, which is an operation that cannot be undone. To confirm that
+   *   the caller desires this overwrite, this field must be explicitly set to
+   *   true when updating the draft environment (environment ID = `-`).
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2beta1.Environment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/environments.update_environment.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Environments_UpdateEnvironment_async
+   */
   updateEnvironment(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateEnvironmentRequest,
     options?: CallOptions
@@ -678,41 +713,6 @@ export class EnvironmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified agent environment.
-   *
-   * This method allows you to deploy new agent versions into the environment.
-   * When an environment is pointed to a new agent version by setting
-   * `environment.agent_version`, the environment is temporarily set to the
-   * `LOADING` state. During that time, the environment keeps on serving the
-   * previous version of the agent. After the new agent version is done loading,
-   * the environment is set back to the `RUNNING` state.
-   * You can use "-" as Environment ID in environment name to update version
-   * in "draft" environment. WARNING: this will negate all recent changes to
-   * draft and can't be undone. You may want to save the draft to a version
-   * before calling this function.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.Environment} request.environment
-   *   Required. The environment to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields get updated.
-   * @param {boolean} [request.allowLoadToDraftAndDiscardChanges]
-   *   Optional. This field is used to prevent accidental overwrite of the draft
-   *   environment, which is an operation that cannot be undone. To confirm that
-   *   the caller desires this overwrite, this field must be explicitly set to
-   *   true when updating the draft environment (environment ID = `-`).
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Environment]{@link google.cloud.dialogflow.v2beta1.Environment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateEnvironment(request);
-   */
   updateEnvironment(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateEnvironmentRequest,
     optionsOrCallback?:
@@ -759,6 +759,27 @@ export class EnvironmentsClient {
     this.initialize();
     return this.innerApiCalls.updateEnvironment(request, options, callback);
   }
+  /**
+   * Deletes the specified agent environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the environment to delete.
+   *   / Format:
+   *   - `projects/<Project Number / ID>/agent/environments/<Environment ID>`
+   *   - `projects/<Project Number / ID>/locations/<Location
+   *   ID>/agent/environments/<Environment ID>`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/environments.delete_environment.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Environments_DeleteEnvironment_async
+   */
   deleteEnvironment(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteEnvironmentRequest,
     options?: CallOptions
@@ -793,27 +814,6 @@ export class EnvironmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified agent environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the environment to delete.
-   *   / Format:
-   *   - `projects/<Project Number / ID>/agent/environments/<Environment ID>`
-   *   - `projects/<Project Number / ID>/locations/<Location
-   *   ID>/agent/environments/<Environment ID>`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteEnvironment(request);
-   */
   deleteEnvironment(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteEnvironmentRequest,
     optionsOrCallback?:
@@ -861,6 +861,34 @@ export class EnvironmentsClient {
     return this.innerApiCalls.deleteEnvironment(request, options, callback);
   }
 
+  /**
+   * Returns the list of all non-draft environments of the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to list all environments from.
+   *   Format:
+   *   - `projects/<Project Number / ID>/agent`
+   *   - `projects/<Project Number / ID>/locations/<Location ID>/agent`
+   * @param {number} [request.pageSize]
+   *   Optional. The maximum number of items to return in a single page. By default 100 and
+   *   at most 1000.
+   * @param {string} [request.pageToken]
+   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Environment]{@link google.cloud.dialogflow.v2beta1.Environment}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listEnvironmentsAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listEnvironments(
     request?: protos.google.cloud.dialogflow.v2beta1.IListEnvironmentsRequest,
     options?: CallOptions
@@ -892,34 +920,6 @@ export class EnvironmentsClient {
       protos.google.cloud.dialogflow.v2beta1.IEnvironment
     >
   ): void;
-  /**
-   * Returns the list of all non-draft environments of the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to list all environments from.
-   *   Format:
-   *   - `projects/<Project Number / ID>/agent`
-   *   - `projects/<Project Number / ID>/locations/<Location ID>/agent`
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By default 100 and
-   *   at most 1000.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Environment]{@link google.cloud.dialogflow.v2beta1.Environment}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listEnvironmentsAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listEnvironments(
     request?: protos.google.cloud.dialogflow.v2beta1.IListEnvironmentsRequest,
     optionsOrCallback?:
@@ -1038,11 +1038,8 @@ export class EnvironmentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listEnvironmentsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/environments.list_environments.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Environments_ListEnvironments_async
    */
   listEnvironmentsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListEnvironmentsRequest,
@@ -1056,7 +1053,6 @@ export class EnvironmentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listEnvironments'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
@@ -1066,6 +1062,35 @@ export class EnvironmentsClient {
       callSettings
     ) as AsyncIterable<protos.google.cloud.dialogflow.v2beta1.IEnvironment>;
   }
+  /**
+   * Gets the history of the specified environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the environment to retrieve history for.
+   *   Supported formats:
+   *   - `projects/<Project Number / ID>/agent/environments/<Environment ID>`
+   *   - `projects/<Project Number / ID>/locations/<Location
+   *     ID>/agent/environments/<Environment ID>`
+   * @param {number} [request.pageSize]
+   *   Optional. The maximum number of items to return in a single page. By default 100 and
+   *   at most 1000.
+   * @param {string} [request.pageToken]
+   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Entry]{@link google.cloud.dialogflow.v2beta1.EnvironmentHistory.Entry}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `getEnvironmentHistoryAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   getEnvironmentHistory(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetEnvironmentHistoryRequest,
     options?: CallOptions
@@ -1097,35 +1122,6 @@ export class EnvironmentsClient {
       protos.google.cloud.dialogflow.v2beta1.EnvironmentHistory.IEntry
     >
   ): void;
-  /**
-   * Gets the history of the specified environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the environment to retrieve history for.
-   *   Supported formats:
-   *   - `projects/<Project Number / ID>/agent/environments/<Environment ID>`
-   *   - `projects/<Project Number / ID>/locations/<Location
-   *     ID>/agent/environments/<Environment ID>`
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By default 100 and
-   *   at most 1000.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Entry]{@link google.cloud.dialogflow.v2beta1.EnvironmentHistory.Entry}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `getEnvironmentHistoryAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   getEnvironmentHistory(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetEnvironmentHistoryRequest,
     optionsOrCallback?:
@@ -1246,11 +1242,8 @@ export class EnvironmentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.getEnvironmentHistoryAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/environments.get_environment_history.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Environments_GetEnvironmentHistory_async
    */
   getEnvironmentHistoryAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetEnvironmentHistoryRequest,
@@ -1264,7 +1257,6 @@ export class EnvironmentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['getEnvironmentHistory'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/fulfillments_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/fulfillments_client.ts
index 989776f60fe..8ac735960d9 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/fulfillments_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/fulfillments_client.ts
@@ -410,6 +410,26 @@ export class FulfillmentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the fulfillment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the fulfillment.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent/fulfillment`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/fulfillment`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Fulfillment]{@link google.cloud.dialogflow.v2beta1.Fulfillment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/fulfillments.get_fulfillment.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Fulfillments_GetFulfillment_async
+   */
   getFulfillment(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetFulfillmentRequest,
     options?: CallOptions
@@ -441,26 +461,6 @@ export class FulfillmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the fulfillment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the fulfillment.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent/fulfillment`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/fulfillment`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Fulfillment]{@link google.cloud.dialogflow.v2beta1.Fulfillment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getFulfillment(request);
-   */
   getFulfillment(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetFulfillmentRequest,
     optionsOrCallback?:
@@ -504,6 +504,26 @@ export class FulfillmentsClient {
     this.initialize();
     return this.innerApiCalls.getFulfillment(request, options, callback);
   }
+  /**
+   * Updates the fulfillment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.Fulfillment} request.fulfillment
+   *   Required. The fulfillment to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields get updated. If the mask is not
+   *   present, all fields will be updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Fulfillment]{@link google.cloud.dialogflow.v2beta1.Fulfillment}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/fulfillments.update_fulfillment.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Fulfillments_UpdateFulfillment_async
+   */
   updateFulfillment(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateFulfillmentRequest,
     options?: CallOptions
@@ -538,26 +558,6 @@ export class FulfillmentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the fulfillment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.Fulfillment} request.fulfillment
-   *   Required. The fulfillment to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields get updated. If the mask is not
-   *   present, all fields will be updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Fulfillment]{@link google.cloud.dialogflow.v2beta1.Fulfillment}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateFulfillment(request);
-   */
   updateFulfillment(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateFulfillmentRequest,
     optionsOrCallback?:
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/intents_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/intents_client.ts
index 96322660381..4f79cb908ae 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/intents_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/intents_client.ts
@@ -484,6 +484,35 @@ export class IntentsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified intent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the intent.
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent/intents/<Intent ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/intents/<Intent ID>`
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {google.cloud.dialogflow.v2beta1.IntentView} request.intentView
+   *   Optional. The resource view to apply to the returned intent.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Intent]{@link google.cloud.dialogflow.v2beta1.Intent}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/intents.get_intent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_GetIntent_async
+   */
   getIntent(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetIntentRequest,
     options?: CallOptions
@@ -515,35 +544,6 @@ export class IntentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified intent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the intent.
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent/intents/<Intent ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/intents/<Intent ID>`
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {google.cloud.dialogflow.v2beta1.IntentView} request.intentView
-   *   Optional. The resource view to apply to the returned intent.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Intent]{@link google.cloud.dialogflow.v2beta1.Intent}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getIntent(request);
-   */
   getIntent(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetIntentRequest,
     optionsOrCallback?:
@@ -587,37 +587,6 @@ export class IntentsClient {
     this.initialize();
     return this.innerApiCalls.getIntent(request, options, callback);
   }
-  createIntent(
-    request?: protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IIntent,
-      protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  createIntent(
-    request: protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IIntent,
-      | protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  createIntent(
-    request: protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IIntent,
-      | protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Creates an intent in the specified agent.
    *
@@ -650,9 +619,40 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.createIntent(request);
+   * @example <caption>include:samples/generated/v2beta1/intents.create_intent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_CreateIntent_async
    */
+  createIntent(
+    request?: protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IIntent,
+      protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  createIntent(
+    request: protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IIntent,
+      | protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  createIntent(
+    request: protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IIntent,
+      | protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   createIntent(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateIntentRequest,
     optionsOrCallback?:
@@ -696,6 +696,37 @@ export class IntentsClient {
     this.initialize();
     return this.innerApiCalls.createIntent(request, options, callback);
   }
+  /**
+   * Updates the specified intent.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.Intent} request.intent
+   *   Required. The intent to update.
+   * @param {string} [request.languageCode]
+   *   Optional. The language used to access language-specific data.
+   *   If not specified, the agent's default language is used.
+   *   For more information, see
+   *   [Multilingual intent and entity
+   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Optional. The mask to control which fields get updated.
+   * @param {google.cloud.dialogflow.v2beta1.IntentView} request.intentView
+   *   Optional. The resource view to apply to the returned intent.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Intent]{@link google.cloud.dialogflow.v2beta1.Intent}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/intents.update_intent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_UpdateIntent_async
+   */
   updateIntent(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateIntentRequest,
     options?: CallOptions
@@ -727,37 +758,6 @@ export class IntentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified intent.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.Intent} request.intent
-   *   Required. The intent to update.
-   * @param {string} [request.languageCode]
-   *   Optional. The language used to access language-specific data.
-   *   If not specified, the agent's default language is used.
-   *   For more information, see
-   *   [Multilingual intent and entity
-   *   data](https://cloud.google.com/dialogflow/docs/agents-multilingual#intent-entity).
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Optional. The mask to control which fields get updated.
-   * @param {google.cloud.dialogflow.v2beta1.IntentView} request.intentView
-   *   Optional. The resource view to apply to the returned intent.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Intent]{@link google.cloud.dialogflow.v2beta1.Intent}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateIntent(request);
-   */
   updateIntent(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateIntentRequest,
     optionsOrCallback?:
@@ -801,6 +801,33 @@ export class IntentsClient {
     this.initialize();
     return this.innerApiCalls.updateIntent(request, options, callback);
   }
+  /**
+   * Deletes the specified intent and its direct or indirect followup intents.
+   *
+   * Note: You should always train an agent prior to sending it queries. See the
+   * [training
+   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the intent to delete. If this intent has direct or
+   *   indirect followup intents, we also delete them.
+   *
+   *   Supported formats:
+   *
+   *   - `projects/<Project ID>/agent/intents/<Intent ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/intents/<Intent ID>`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/intents.delete_intent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_DeleteIntent_async
+   */
   deleteIntent(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteIntentRequest,
     options?: CallOptions
@@ -832,33 +859,6 @@ export class IntentsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified intent and its direct or indirect followup intents.
-   *
-   * Note: You should always train an agent prior to sending it queries. See the
-   * [training
-   * documentation](https://cloud.google.com/dialogflow/es/docs/training).
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the intent to delete. If this intent has direct or
-   *   indirect followup intents, we also delete them.
-   *
-   *   Supported formats:
-   *
-   *   - `projects/<Project ID>/agent/intents/<Intent ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/intents/<Intent ID>`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteIntent(request);
-   */
   deleteIntent(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteIntentRequest,
     optionsOrCallback?:
@@ -903,42 +903,6 @@ export class IntentsClient {
     return this.innerApiCalls.deleteIntent(request, options, callback);
   }
 
-  batchUpdateIntents(
-    request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchUpdateIntents(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchUpdateIntents(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsResponse,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Updates/Creates multiple intents in the specified agent.
    *
@@ -987,10 +951,45 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchUpdateIntents(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/intents.batch_update_intents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_BatchUpdateIntents_async
    */
+  batchUpdateIntents(
+    request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchUpdateIntents(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchUpdateIntents(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsResponse,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchUpdateIntents(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchUpdateIntentsRequest,
     optionsOrCallback?:
@@ -1048,11 +1047,8 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchUpdateIntentsProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/intents.batch_update_intents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_BatchUpdateIntents_async
    */
   async checkBatchUpdateIntentsProgress(
     name: string
@@ -1076,42 +1072,6 @@ export class IntentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  batchDeleteIntents(
-    request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteIntentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | undefined,
-      {} | undefined
-    ]
-  >;
-  batchDeleteIntents(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteIntentsRequest,
-    options: CallOptions,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  batchDeleteIntents(
-    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteIntentsRequest,
-    callback: Callback<
-      LROperation<
-        protos.google.protobuf.IEmpty,
-        protos.google.protobuf.IStruct
-      >,
-      protos.google.longrunning.IOperation | null | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Deletes intents in the specified agent.
    *
@@ -1148,10 +1108,45 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const [operation] = await client.batchDeleteIntents(request);
-   * const [response] = await operation.promise();
+   * @example <caption>include:samples/generated/v2beta1/intents.batch_delete_intents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_BatchDeleteIntents_async
    */
+  batchDeleteIntents(
+    request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteIntentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | undefined,
+      {} | undefined
+    ]
+  >;
+  batchDeleteIntents(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteIntentsRequest,
+    options: CallOptions,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  batchDeleteIntents(
+    request: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteIntentsRequest,
+    callback: Callback<
+      LROperation<
+        protos.google.protobuf.IEmpty,
+        protos.google.protobuf.IStruct
+      >,
+      protos.google.longrunning.IOperation | null | undefined,
+      {} | null | undefined
+    >
+  ): void;
   batchDeleteIntents(
     request?: protos.google.cloud.dialogflow.v2beta1.IBatchDeleteIntentsRequest,
     optionsOrCallback?:
@@ -1209,11 +1204,8 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#long-running-operations)
    *   for more details and examples.
-   * @example
-   * const decodedOperation = await checkBatchDeleteIntentsProgress(name);
-   * console.log(decodedOperation.result);
-   * console.log(decodedOperation.done);
-   * console.log(decodedOperation.metadata);
+   * @example <caption>include:samples/generated/v2beta1/intents.batch_delete_intents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_BatchDeleteIntents_async
    */
   async checkBatchDeleteIntentsProgress(
     name: string
@@ -1234,37 +1226,6 @@ export class IntentsClient {
       protos.google.protobuf.Struct
     >;
   }
-  listIntents(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IIntent[],
-      protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListIntentsResponse
-    ]
-  >;
-  listIntents(
-    request: protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListIntentsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IIntent
-    >
-  ): void;
-  listIntents(
-    request: protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListIntentsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IIntent
-    >
-  ): void;
   /**
    * Returns the list of all intents in the specified agent.
    *
@@ -1307,6 +1268,37 @@ export class IntentsClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listIntents(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IIntent[],
+      protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListIntentsResponse
+    ]
+  >;
+  listIntents(
+    request: protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListIntentsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IIntent
+    >
+  ): void;
+  listIntents(
+    request: protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListIntentsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IIntent
+    >
+  ): void;
   listIntents(
     request?: protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
     optionsOrCallback?:
@@ -1453,11 +1445,8 @@ export class IntentsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listIntentsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/intents.list_intents.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Intents_ListIntents_async
    */
   listIntentsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListIntentsRequest,
@@ -1471,7 +1460,6 @@ export class IntentsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listIntents'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/knowledge_bases_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/knowledge_bases_client.ts
index a2eed2b7d7e..e0e912da84f 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/knowledge_bases_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/knowledge_bases_client.ts
@@ -439,6 +439,28 @@ export class KnowledgeBasesClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified knowledge base.
+   *
+   * Note: The `projects.agent.knowledgeBases` resource is deprecated;
+   * only use `projects.knowledgeBases`.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the knowledge base to retrieve.
+   *   Format `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2beta1.KnowledgeBase}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/knowledge_bases.get_knowledge_base.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_KnowledgeBases_GetKnowledgeBase_async
+   */
   getKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetKnowledgeBaseRequest,
     options?: CallOptions
@@ -473,28 +495,6 @@ export class KnowledgeBasesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified knowledge base.
-   *
-   * Note: The `projects.agent.knowledgeBases` resource is deprecated;
-   * only use `projects.knowledgeBases`.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the knowledge base to retrieve.
-   *   Format `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2beta1.KnowledgeBase}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getKnowledgeBase(request);
-   */
   getKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetKnowledgeBaseRequest,
     optionsOrCallback?:
@@ -541,6 +541,29 @@ export class KnowledgeBasesClient {
     this.initialize();
     return this.innerApiCalls.getKnowledgeBase(request, options, callback);
   }
+  /**
+   * Creates a knowledge base.
+   *
+   * Note: The `projects.agent.knowledgeBases` resource is deprecated;
+   * only use `projects.knowledgeBases`.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The project to create a knowledge base for.
+   *   Format: `projects/<Project ID>/locations/<Location ID>`.
+   * @param {google.cloud.dialogflow.v2beta1.KnowledgeBase} request.knowledgeBase
+   *   Required. The knowledge base to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2beta1.KnowledgeBase}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/knowledge_bases.create_knowledge_base.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_KnowledgeBases_CreateKnowledgeBase_async
+   */
   createKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateKnowledgeBaseRequest,
     options?: CallOptions
@@ -575,29 +598,6 @@ export class KnowledgeBasesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a knowledge base.
-   *
-   * Note: The `projects.agent.knowledgeBases` resource is deprecated;
-   * only use `projects.knowledgeBases`.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The project to create a knowledge base for.
-   *   Format: `projects/<Project ID>/locations/<Location ID>`.
-   * @param {google.cloud.dialogflow.v2beta1.KnowledgeBase} request.knowledgeBase
-   *   Required. The knowledge base to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2beta1.KnowledgeBase}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createKnowledgeBase(request);
-   */
   createKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateKnowledgeBaseRequest,
     optionsOrCallback?:
@@ -644,6 +644,31 @@ export class KnowledgeBasesClient {
     this.initialize();
     return this.innerApiCalls.createKnowledgeBase(request, options, callback);
   }
+  /**
+   * Deletes the specified knowledge base.
+   *
+   * Note: The `projects.agent.knowledgeBases` resource is deprecated;
+   * only use `projects.knowledgeBases`.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the knowledge base to delete.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/knowledgeBases/<Knowledge Base ID>`.
+   * @param {boolean} [request.force]
+   *   Optional. Force deletes the knowledge base. When set to true, any documents
+   *   in the knowledge base are also deleted.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/knowledge_bases.delete_knowledge_base.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_KnowledgeBases_DeleteKnowledgeBase_async
+   */
   deleteKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteKnowledgeBaseRequest,
     options?: CallOptions
@@ -678,31 +703,6 @@ export class KnowledgeBasesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified knowledge base.
-   *
-   * Note: The `projects.agent.knowledgeBases` resource is deprecated;
-   * only use `projects.knowledgeBases`.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the knowledge base to delete.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/knowledgeBases/<Knowledge Base ID>`.
-   * @param {boolean} [request.force]
-   *   Optional. Force deletes the knowledge base. When set to true, any documents
-   *   in the knowledge base are also deleted.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteKnowledgeBase(request);
-   */
   deleteKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteKnowledgeBaseRequest,
     optionsOrCallback?:
@@ -749,6 +749,30 @@ export class KnowledgeBasesClient {
     this.initialize();
     return this.innerApiCalls.deleteKnowledgeBase(request, options, callback);
   }
+  /**
+   * Updates the specified knowledge base.
+   *
+   * Note: The `projects.agent.knowledgeBases` resource is deprecated;
+   * only use `projects.knowledgeBases`.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.KnowledgeBase} request.knowledgeBase
+   *   Required. The knowledge base to update.
+   * @param {google.protobuf.FieldMask} [request.updateMask]
+   *   Optional. Not specified means `update all`.
+   *   Currently, only `display_name` can be updated, an InvalidArgument will be
+   *   returned for attempting to update other fields.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2beta1.KnowledgeBase}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/knowledge_bases.update_knowledge_base.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_KnowledgeBases_UpdateKnowledgeBase_async
+   */
   updateKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateKnowledgeBaseRequest,
     options?: CallOptions
@@ -783,30 +807,6 @@ export class KnowledgeBasesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified knowledge base.
-   *
-   * Note: The `projects.agent.knowledgeBases` resource is deprecated;
-   * only use `projects.knowledgeBases`.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.KnowledgeBase} request.knowledgeBase
-   *   Required. The knowledge base to update.
-   * @param {google.protobuf.FieldMask} [request.updateMask]
-   *   Optional. Not specified means `update all`.
-   *   Currently, only `display_name` can be updated, an InvalidArgument will be
-   *   returned for attempting to update other fields.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [KnowledgeBase]{@link google.cloud.dialogflow.v2beta1.KnowledgeBase}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateKnowledgeBase(request);
-   */
   updateKnowledgeBase(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateKnowledgeBaseRequest,
     optionsOrCallback?:
@@ -854,37 +854,6 @@ export class KnowledgeBasesClient {
     return this.innerApiCalls.updateKnowledgeBase(request, options, callback);
   }
 
-  listKnowledgeBases(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IKnowledgeBase[],
-      protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesResponse
-    ]
-  >;
-  listKnowledgeBases(
-    request: protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IKnowledgeBase
-    >
-  ): void;
-  listKnowledgeBases(
-    request: protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.IKnowledgeBase
-    >
-  ): void;
   /**
    * Returns the list of all knowledge bases of the specified agent.
    *
@@ -941,6 +910,37 @@ export class KnowledgeBasesClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listKnowledgeBases(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IKnowledgeBase[],
+      protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesResponse
+    ]
+  >;
+  listKnowledgeBases(
+    request: protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IKnowledgeBase
+    >
+  ): void;
+  listKnowledgeBases(
+    request: protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.IKnowledgeBase
+    >
+  ): void;
   listKnowledgeBases(
     request?: protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
     optionsOrCallback?:
@@ -1109,11 +1109,8 @@ export class KnowledgeBasesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listKnowledgeBasesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/knowledge_bases.list_knowledge_bases.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_KnowledgeBases_ListKnowledgeBases_async
    */
   listKnowledgeBasesAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListKnowledgeBasesRequest,
@@ -1127,7 +1124,6 @@ export class KnowledgeBasesClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listKnowledgeBases'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/participants_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/participants_client.ts
index 9c233407565..f4e73e55a76 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/participants_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/participants_client.ts
@@ -449,6 +449,27 @@ export class ParticipantsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Creates a new participant in a conversation.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. Resource identifier of the conversation adding the participant.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>`.
+   * @param {google.cloud.dialogflow.v2beta1.Participant} request.participant
+   *   Required. The participant to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2beta1.Participant}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/participants.create_participant.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_CreateParticipant_async
+   */
   createParticipant(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateParticipantRequest,
     options?: CallOptions
@@ -483,27 +504,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates a new participant in a conversation.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. Resource identifier of the conversation adding the participant.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>`.
-   * @param {google.cloud.dialogflow.v2beta1.Participant} request.participant
-   *   Required. The participant to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2beta1.Participant}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createParticipant(request);
-   */
   createParticipant(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateParticipantRequest,
     optionsOrCallback?:
@@ -550,6 +550,25 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.createParticipant(request, options, callback);
   }
+  /**
+   * Retrieves a conversation participant.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the participant. Format:
+   *   `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
+   *   ID>/participants/<Participant ID>`.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2beta1.Participant}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/participants.get_participant.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_GetParticipant_async
+   */
   getParticipant(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetParticipantRequest,
     options?: CallOptions
@@ -581,25 +600,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves a conversation participant.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the participant. Format:
-   *   `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
-   *   ID>/participants/<Participant ID>`.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2beta1.Participant}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getParticipant(request);
-   */
   getParticipant(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetParticipantRequest,
     optionsOrCallback?:
@@ -643,6 +643,25 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.getParticipant(request, options, callback);
   }
+  /**
+   * Updates the specified participant.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.Participant} request.participant
+   *   Required. The participant to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to specify which fields to update.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2beta1.Participant}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/participants.update_participant.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_UpdateParticipant_async
+   */
   updateParticipant(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateParticipantRequest,
     options?: CallOptions
@@ -677,25 +696,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified participant.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.Participant} request.participant
-   *   Required. The participant to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to specify which fields to update.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Participant]{@link google.cloud.dialogflow.v2beta1.Participant}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateParticipant(request);
-   */
   updateParticipant(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateParticipantRequest,
     optionsOrCallback?:
@@ -742,37 +742,6 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.updateParticipant(request, options, callback);
   }
-  analyzeContent(
-    request?: protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentResponse,
-      protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  analyzeContent(
-    request: protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentResponse,
-      | protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  analyzeContent(
-    request: protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentResponse,
-      | protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Adds a text (chat, for example), or audio (phone recording, for example)
    * message from a participant into the conversation.
@@ -825,9 +794,40 @@ export class ParticipantsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.analyzeContent(request);
+   * @example <caption>include:samples/generated/v2beta1/participants.analyze_content.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_AnalyzeContent_async
    */
+  analyzeContent(
+    request?: protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentResponse,
+      protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  analyzeContent(
+    request: protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentResponse,
+      | protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  analyzeContent(
+    request: protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentResponse,
+      | protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   analyzeContent(
     request?: protos.google.cloud.dialogflow.v2beta1.IAnalyzeContentRequest,
     optionsOrCallback?:
@@ -871,6 +871,40 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.analyzeContent(request, options, callback);
   }
+  /**
+   * Gets suggested articles for a participant based on specific historical
+   * messages.
+   *
+   * Note that {@link google.cloud.dialogflow.v2beta1.Participants.ListSuggestions|ListSuggestions} will only list the auto-generated
+   * suggestions, while {@link google.cloud.dialogflow.v2beta1.Participants.CompileSuggestion|CompileSuggestion} will try to compile suggestion
+   * based on the provided conversation context in the real time.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the participant to fetch suggestion for.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
+   * @param {string} [request.latestMessage]
+   *   Optional. The name of the latest conversation message to compile suggestion
+   *   for. If empty, it will be the latest message of the conversation.
+   *
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>/messages/<Message ID>`.
+   * @param {number} [request.contextSize]
+   *   Optional. Max number of messages prior to and including
+   *   {@link google.cloud.dialogflow.v2beta1.SuggestArticlesRequest.latest_message|latest_message} to use as context
+   *   when compiling the suggestion. By default 20 and at most 50.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SuggestArticlesResponse]{@link google.cloud.dialogflow.v2beta1.SuggestArticlesResponse}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/participants.suggest_articles.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_SuggestArticles_async
+   */
   suggestArticles(
     request?: protos.google.cloud.dialogflow.v2beta1.ISuggestArticlesRequest,
     options?: CallOptions
@@ -905,40 +939,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Gets suggested articles for a participant based on specific historical
-   * messages.
-   *
-   * Note that {@link google.cloud.dialogflow.v2beta1.Participants.ListSuggestions|ListSuggestions} will only list the auto-generated
-   * suggestions, while {@link google.cloud.dialogflow.v2beta1.Participants.CompileSuggestion|CompileSuggestion} will try to compile suggestion
-   * based on the provided conversation context in the real time.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the participant to fetch suggestion for.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
-   * @param {string} [request.latestMessage]
-   *   Optional. The name of the latest conversation message to compile suggestion
-   *   for. If empty, it will be the latest message of the conversation.
-   *
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>/messages/<Message ID>`.
-   * @param {number} [request.contextSize]
-   *   Optional. Max number of messages prior to and including
-   *   {@link google.cloud.dialogflow.v2beta1.SuggestArticlesRequest.latest_message|latest_message} to use as context
-   *   when compiling the suggestion. By default 20 and at most 50.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SuggestArticlesResponse]{@link google.cloud.dialogflow.v2beta1.SuggestArticlesResponse}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.suggestArticles(request);
-   */
   suggestArticles(
     request?: protos.google.cloud.dialogflow.v2beta1.ISuggestArticlesRequest,
     optionsOrCallback?:
@@ -985,40 +985,6 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.suggestArticles(request, options, callback);
   }
-  suggestFaqAnswers(
-    request?: protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersResponse,
-      (
-        | protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest
-        | undefined
-      ),
-      {} | undefined
-    ]
-  >;
-  suggestFaqAnswers(
-    request: protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersResponse,
-      | protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  suggestFaqAnswers(
-    request: protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersResponse,
-      | protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Gets suggested faq answers for a participant based on specific historical
    * messages.
@@ -1046,9 +1012,43 @@ export class ParticipantsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.suggestFaqAnswers(request);
+   * @example <caption>include:samples/generated/v2beta1/participants.suggest_faq_answers.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_SuggestFaqAnswers_async
    */
+  suggestFaqAnswers(
+    request?: protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersResponse,
+      (
+        | protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest
+        | undefined
+      ),
+      {} | undefined
+    ]
+  >;
+  suggestFaqAnswers(
+    request: protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersResponse,
+      | protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  suggestFaqAnswers(
+    request: protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersResponse,
+      | protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   suggestFaqAnswers(
     request?: protos.google.cloud.dialogflow.v2beta1.ISuggestFaqAnswersRequest,
     optionsOrCallback?:
@@ -1095,6 +1095,40 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.suggestFaqAnswers(request, options, callback);
   }
+  /**
+   * Gets smart replies for a participant based on specific historical
+   * messages.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The name of the participant to fetch suggestion for.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
+   * @param {google.cloud.dialogflow.v2beta1.TextInput} request.currentTextInput
+   *   The current natural language text segment to compile suggestion
+   *   for. This provides a way for user to get follow up smart reply suggestion
+   *   after a smart reply selection, without sending a text message.
+   * @param {string} request.latestMessage
+   *   The name of the latest conversation message to compile suggestion
+   *   for. If empty, it will be the latest message of the conversation.
+   *
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>/messages/<Message ID>`.
+   * @param {number} request.contextSize
+   *   Optional. Max number of messages prior to and including
+   *   [latest_message] to use as context when compiling the
+   *   suggestion. By default 20 and at most 50.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SuggestSmartRepliesResponse]{@link google.cloud.dialogflow.v2beta1.SuggestSmartRepliesResponse}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/participants.suggest_smart_replies.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_SuggestSmartReplies_async
+   */
   suggestSmartReplies(
     request?: protos.google.cloud.dialogflow.v2beta1.ISuggestSmartRepliesRequest,
     options?: CallOptions
@@ -1129,40 +1163,6 @@ export class ParticipantsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Gets smart replies for a participant based on specific historical
-   * messages.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The name of the participant to fetch suggestion for.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
-   * @param {google.cloud.dialogflow.v2beta1.TextInput} request.currentTextInput
-   *   The current natural language text segment to compile suggestion
-   *   for. This provides a way for user to get follow up smart reply suggestion
-   *   after a smart reply selection, without sending a text message.
-   * @param {string} request.latestMessage
-   *   The name of the latest conversation message to compile suggestion
-   *   for. If empty, it will be the latest message of the conversation.
-   *
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>/messages/<Message ID>`.
-   * @param {number} request.contextSize
-   *   Optional. Max number of messages prior to and including
-   *   [latest_message] to use as context when compiling the
-   *   suggestion. By default 20 and at most 50.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SuggestSmartRepliesResponse]{@link google.cloud.dialogflow.v2beta1.SuggestSmartRepliesResponse}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.suggestSmartReplies(request);
-   */
   suggestSmartReplies(
     request?: protos.google.cloud.dialogflow.v2beta1.ISuggestSmartRepliesRequest,
     optionsOrCallback?:
@@ -1209,40 +1209,6 @@ export class ParticipantsClient {
     this.initialize();
     return this.innerApiCalls.suggestSmartReplies(request, options, callback);
   }
-  compileSuggestion(
-    request?: protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionResponse,
-      (
-        | protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest
-        | undefined
-      ),
-      {} | undefined
-    ]
-  >;
-  compileSuggestion(
-    request: protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionResponse,
-      | protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  compileSuggestion(
-    request: protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionResponse,
-      | protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Deprecated. use {@link google.cloud.dialogflow.v2beta1.Participants.SuggestArticles|SuggestArticles} and {@link google.cloud.dialogflow.v2beta1.Participants.SuggestFaqAnswers|SuggestFaqAnswers} instead.
    *
@@ -1276,10 +1242,44 @@ export class ParticipantsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.compileSuggestion(request);
+   * @example <caption>include:samples/generated/v2beta1/participants.compile_suggestion.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_CompileSuggestion_async
    * @deprecated CompileSuggestion is deprecated and may be removed in a future version.
    */
+  compileSuggestion(
+    request?: protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionResponse,
+      (
+        | protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest
+        | undefined
+      ),
+      {} | undefined
+    ]
+  >;
+  compileSuggestion(
+    request: protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionResponse,
+      | protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  compileSuggestion(
+    request: protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionResponse,
+      | protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   compileSuggestion(
     request?: protos.google.cloud.dialogflow.v2beta1.ICompileSuggestionRequest,
     optionsOrCallback?:
@@ -1332,6 +1332,33 @@ export class ParticipantsClient {
     return this.innerApiCalls.compileSuggestion(request, options, callback);
   }
 
+  /**
+   * Returns the list of all participants in the specified conversation.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The conversation to list all participants from.
+   *   Format: `projects/<Project ID>/locations/<Location
+   *   ID>/conversations/<Conversation ID>`.
+   * @param {number} [request.pageSize]
+   *   Optional. The maximum number of items to return in a single page. By
+   *   default 100 and at most 1000.
+   * @param {string} [request.pageToken]
+   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Participant]{@link google.cloud.dialogflow.v2beta1.Participant}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listParticipantsAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listParticipants(
     request?: protos.google.cloud.dialogflow.v2beta1.IListParticipantsRequest,
     options?: CallOptions
@@ -1363,33 +1390,6 @@ export class ParticipantsClient {
       protos.google.cloud.dialogflow.v2beta1.IParticipant
     >
   ): void;
-  /**
-   * Returns the list of all participants in the specified conversation.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The conversation to list all participants from.
-   *   Format: `projects/<Project ID>/locations/<Location
-   *   ID>/conversations/<Conversation ID>`.
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By
-   *   default 100 and at most 1000.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Participant]{@link google.cloud.dialogflow.v2beta1.Participant}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listParticipantsAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listParticipants(
     request?: protos.google.cloud.dialogflow.v2beta1.IListParticipantsRequest,
     optionsOrCallback?:
@@ -1506,11 +1506,8 @@ export class ParticipantsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listParticipantsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/participants.list_participants.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_ListParticipants_async
    */
   listParticipantsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListParticipantsRequest,
@@ -1524,7 +1521,6 @@ export class ParticipantsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listParticipants'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
@@ -1534,37 +1530,6 @@ export class ParticipantsClient {
       callSettings
     ) as AsyncIterable<protos.google.cloud.dialogflow.v2beta1.IParticipant>;
   }
-  listSuggestions(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.ISuggestion[],
-      protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListSuggestionsResponse
-    ]
-  >;
-  listSuggestions(
-    request: protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListSuggestionsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.ISuggestion
-    >
-  ): void;
-  listSuggestions(
-    request: protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListSuggestionsResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.ISuggestion
-    >
-  ): void;
   /**
    * Deprecated: Use inline suggestion, event based suggestion or
    * Suggestion* API instead.
@@ -1621,6 +1586,37 @@ export class ParticipantsClient {
    *   for more details and examples.
    * @deprecated ListSuggestions is deprecated and may be removed in a future version.
    */
+  listSuggestions(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.ISuggestion[],
+      protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListSuggestionsResponse
+    ]
+  >;
+  listSuggestions(
+    request: protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListSuggestionsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.ISuggestion
+    >
+  ): void;
+  listSuggestions(
+    request: protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListSuggestionsResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.ISuggestion
+    >
+  ): void;
   listSuggestions(
     request?: protos.google.cloud.dialogflow.v2beta1.IListSuggestionsRequest,
     optionsOrCallback?:
@@ -1766,11 +1762,8 @@ export class ParticipantsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listSuggestionsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/participants.list_suggestions.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Participants_ListSuggestions_async
    * @deprecated ListSuggestions is deprecated and may be removed in a future version.
    */
   listSuggestionsAsync(
@@ -1785,7 +1778,6 @@ export class ParticipantsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listSuggestions'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/session_entity_types_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/session_entity_types_client.ts
index da650030901..490cd67e9d4 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/session_entity_types_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/session_entity_types_client.ts
@@ -443,6 +443,40 @@ export class SessionEntityTypesClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified session entity type.
+   *
+   * This method doesn't work with Google Assistant integration.
+   * Contact Dialogflow support if you need to use session entities
+   * with Google Assistant integration.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the session entity type. Supported formats:
+   *   - `projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity
+   *     Type Display Name>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
+   *     ID>/entityTypes/<Entity Type Display Name>`
+   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *     ID>/sessions/<Session ID>/entityTypes/<Entity Type Display Name>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/environments/
+   *     <Environment ID>/users/<User ID>/sessions/<Session
+   *     ID>/entityTypes/<Entity Type Display Name>`
+   *
+   *   If `Location ID` is not specified we assume default 'us' location. If
+   *   `Environment ID` is not specified, we assume default 'draft' environment.
+   *   If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2beta1.SessionEntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/session_entity_types.get_session_entity_type.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_SessionEntityTypes_GetSessionEntityType_async
+   */
   getSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetSessionEntityTypeRequest,
     options?: CallOptions
@@ -477,40 +511,6 @@ export class SessionEntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified session entity type.
-   *
-   * This method doesn't work with Google Assistant integration.
-   * Contact Dialogflow support if you need to use session entities
-   * with Google Assistant integration.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the session entity type. Supported formats:
-   *   - `projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity
-   *     Type Display Name>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
-   *     ID>/entityTypes/<Entity Type Display Name>`
-   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *     ID>/sessions/<Session ID>/entityTypes/<Entity Type Display Name>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/environments/
-   *     <Environment ID>/users/<User ID>/sessions/<Session
-   *     ID>/entityTypes/<Entity Type Display Name>`
-   *
-   *   If `Location ID` is not specified we assume default 'us' location. If
-   *   `Environment ID` is not specified, we assume default 'draft' environment.
-   *   If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2beta1.SessionEntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getSessionEntityType(request);
-   */
   getSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetSessionEntityTypeRequest,
     optionsOrCallback?:
@@ -557,40 +557,6 @@ export class SessionEntityTypesClient {
     this.initialize();
     return this.innerApiCalls.getSessionEntityType(request, options, callback);
   }
-  createSessionEntityType(
-    request?: protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType,
-      (
-        | protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest
-        | undefined
-      ),
-      {} | undefined
-    ]
-  >;
-  createSessionEntityType(
-    request: protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType,
-      | protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  createSessionEntityType(
-    request: protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType,
-      | protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Creates a session entity type.
    *
@@ -627,9 +593,43 @@ export class SessionEntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.createSessionEntityType(request);
+   * @example <caption>include:samples/generated/v2beta1/session_entity_types.create_session_entity_type.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_SessionEntityTypes_CreateSessionEntityType_async
    */
+  createSessionEntityType(
+    request?: protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType,
+      (
+        | protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest
+        | undefined
+      ),
+      {} | undefined
+    ]
+  >;
+  createSessionEntityType(
+    request: protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType,
+      | protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  createSessionEntityType(
+    request: protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType,
+      | protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   createSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateSessionEntityTypeRequest,
     optionsOrCallback?:
@@ -680,6 +680,29 @@ export class SessionEntityTypesClient {
       callback
     );
   }
+  /**
+   * Updates the specified session entity type.
+   *
+   * This method doesn't work with Google Assistant integration.
+   * Contact Dialogflow support if you need to use session entities
+   * with Google Assistant integration.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.SessionEntityType} request.sessionEntityType
+   *   Required. The session entity type to update.
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Optional. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2beta1.SessionEntityType}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/session_entity_types.update_session_entity_type.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_SessionEntityTypes_UpdateSessionEntityType_async
+   */
   updateSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateSessionEntityTypeRequest,
     options?: CallOptions
@@ -714,29 +737,6 @@ export class SessionEntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified session entity type.
-   *
-   * This method doesn't work with Google Assistant integration.
-   * Contact Dialogflow support if you need to use session entities
-   * with Google Assistant integration.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.SessionEntityType} request.sessionEntityType
-   *   Required. The session entity type to update.
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Optional. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [SessionEntityType]{@link google.cloud.dialogflow.v2beta1.SessionEntityType}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateSessionEntityType(request);
-   */
   updateSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateSessionEntityTypeRequest,
     optionsOrCallback?:
@@ -787,6 +787,41 @@ export class SessionEntityTypesClient {
       callback
     );
   }
+  /**
+   * Deletes the specified session entity type.
+   *
+   * This method doesn't work with Google Assistant integration.
+   * Contact Dialogflow support if you need to use session entities
+   * with Google Assistant integration.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the entity type to delete.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity
+   *     Type Display Name>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
+   *     ID>/entityTypes/<Entity Type Display Name>`
+   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
+   *     ID>/sessions/<Session ID>/entityTypes/<Entity Type Display Name>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/environments/
+   *     <Environment ID>/users/<User ID>/sessions/<Session
+   *     ID>/entityTypes/<Entity Type Display Name>`
+   *
+   *   If `Location ID` is not specified we assume default 'us' location. If
+   *   `Environment ID` is not specified, we assume default 'draft' environment.
+   *   If `User ID` is not specified, we assume default '-' user.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/session_entity_types.delete_session_entity_type.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_SessionEntityTypes_DeleteSessionEntityType_async
+   */
   deleteSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteSessionEntityTypeRequest,
     options?: CallOptions
@@ -821,41 +856,6 @@ export class SessionEntityTypesClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Deletes the specified session entity type.
-   *
-   * This method doesn't work with Google Assistant integration.
-   * Contact Dialogflow support if you need to use session entities
-   * with Google Assistant integration.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the entity type to delete.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent/sessions/<Session ID>/entityTypes/<Entity
-   *     Type Display Name>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/sessions/<Session
-   *     ID>/entityTypes/<Entity Type Display Name>`
-   *   - `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
-   *     ID>/sessions/<Session ID>/entityTypes/<Entity Type Display Name>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/environments/
-   *     <Environment ID>/users/<User ID>/sessions/<Session
-   *     ID>/entityTypes/<Entity Type Display Name>`
-   *
-   *   If `Location ID` is not specified we assume default 'us' location. If
-   *   `Environment ID` is not specified, we assume default 'draft' environment.
-   *   If `User ID` is not specified, we assume default '-' user.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteSessionEntityType(request);
-   */
   deleteSessionEntityType(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteSessionEntityTypeRequest,
     optionsOrCallback?:
@@ -907,37 +907,6 @@ export class SessionEntityTypesClient {
     );
   }
 
-  listSessionEntityTypes(
-    request?: protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType[],
-      protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest | null,
-      protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesResponse
-    ]
-  >;
-  listSessionEntityTypes(
-    request: protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
-    options: CallOptions,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType
-    >
-  ): void;
-  listSessionEntityTypes(
-    request: protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
-    callback: PaginationCallback<
-      protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
-      | protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesResponse
-      | null
-      | undefined,
-      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType
-    >
-  ): void;
   /**
    * Returns the list of all session entity types in the specified session.
    *
@@ -980,6 +949,37 @@ export class SessionEntityTypesClient {
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
    */
+  listSessionEntityTypes(
+    request?: protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType[],
+      protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest | null,
+      protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesResponse
+    ]
+  >;
+  listSessionEntityTypes(
+    request: protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
+    options: CallOptions,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType
+    >
+  ): void;
+  listSessionEntityTypes(
+    request: protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
+    callback: PaginationCallback<
+      protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
+      | protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesResponse
+      | null
+      | undefined,
+      protos.google.cloud.dialogflow.v2beta1.ISessionEntityType
+    >
+  ): void;
   listSessionEntityTypes(
     request?: protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
     optionsOrCallback?:
@@ -1122,11 +1122,8 @@ export class SessionEntityTypesClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listSessionEntityTypesAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/session_entity_types.list_session_entity_types.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_SessionEntityTypes_ListSessionEntityTypes_async
    */
   listSessionEntityTypesAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListSessionEntityTypesRequest,
@@ -1140,7 +1137,6 @@ export class SessionEntityTypesClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listSessionEntityTypes'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/sessions_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/sessions_client.ts
index f03de918580..d69acaed05a 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/sessions_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/sessions_client.ts
@@ -435,37 +435,6 @@ export class SessionsClient {
   // -------------------
   // -- Service calls --
   // -------------------
-  detectIntent(
-    request?: protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest,
-    options?: CallOptions
-  ): Promise<
-    [
-      protos.google.cloud.dialogflow.v2beta1.IDetectIntentResponse,
-      protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest | undefined,
-      {} | undefined
-    ]
-  >;
-  detectIntent(
-    request: protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest,
-    options: CallOptions,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IDetectIntentResponse,
-      | protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
-  detectIntent(
-    request: protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest,
-    callback: Callback<
-      protos.google.cloud.dialogflow.v2beta1.IDetectIntentResponse,
-      | protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest
-      | null
-      | undefined,
-      {} | null | undefined
-    >
-  ): void;
   /**
    * Processes a natural language query and returns structured, actionable data
    * as a result. This method is not idempotent, because it may cause contexts
@@ -542,9 +511,40 @@ export class SessionsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
    *   for more details and examples.
-   * @example
-   * const [response] = await client.detectIntent(request);
+   * @example <caption>include:samples/generated/v2beta1/sessions.detect_intent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Sessions_DetectIntent_async
    */
+  detectIntent(
+    request?: protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest,
+    options?: CallOptions
+  ): Promise<
+    [
+      protos.google.cloud.dialogflow.v2beta1.IDetectIntentResponse,
+      protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest | undefined,
+      {} | undefined
+    ]
+  >;
+  detectIntent(
+    request: protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest,
+    options: CallOptions,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IDetectIntentResponse,
+      | protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
+  detectIntent(
+    request: protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest,
+    callback: Callback<
+      protos.google.cloud.dialogflow.v2beta1.IDetectIntentResponse,
+      | protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest
+      | null
+      | undefined,
+      {} | null | undefined
+    >
+  ): void;
   detectIntent(
     request?: protos.google.cloud.dialogflow.v2beta1.IDetectIntentRequest,
     optionsOrCallback?:
@@ -614,12 +614,8 @@ export class SessionsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#bi-directional-streaming)
    *   for more details and examples.
-   * @example
-   * const stream = client.streamingDetectIntent();
-   * stream.on('data', (response) => { ... });
-   * stream.on('end', () => { ... });
-   * stream.write(request);
-   * stream.end();
+   * @example <caption>include:samples/generated/v2beta1/sessions.streaming_detect_intent.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Sessions_StreamingDetectIntent_async
    */
   streamingDetectIntent(options?: CallOptions): gax.CancellableStream {
     this.initialize();
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/versions_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/versions_client.ts
index a164fd380d5..9f2278edfe3 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/versions_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/versions_client.ts
@@ -439,6 +439,27 @@ export class VersionsClient {
   // -------------------
   // -- Service calls --
   // -------------------
+  /**
+   * Retrieves the specified agent version.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the version.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent/versions/<Version ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
+   *     ID>`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2beta1.Version}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/versions.get_version.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Versions_GetVersion_async
+   */
   getVersion(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetVersionRequest,
     options?: CallOptions
@@ -470,27 +491,6 @@ export class VersionsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Retrieves the specified agent version.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the version.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent/versions/<Version ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
-   *     ID>`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2beta1.Version}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.getVersion(request);
-   */
   getVersion(
     request?: protos.google.cloud.dialogflow.v2beta1.IGetVersionRequest,
     optionsOrCallback?:
@@ -534,6 +534,30 @@ export class VersionsClient {
     this.initialize();
     return this.innerApiCalls.getVersion(request, options, callback);
   }
+  /**
+   * Creates an agent version.
+   *
+   * The new version points to the agent instance in the "default" environment.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to create a version for.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent`
+   * @param {google.cloud.dialogflow.v2beta1.Version} request.version
+   *   Required. The version to create.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2beta1.Version}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/versions.create_version.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Versions_CreateVersion_async
+   */
   createVersion(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateVersionRequest,
     options?: CallOptions
@@ -565,30 +589,6 @@ export class VersionsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Creates an agent version.
-   *
-   * The new version points to the agent instance in the "default" environment.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to create a version for.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent`
-   * @param {google.cloud.dialogflow.v2beta1.Version} request.version
-   *   Required. The version to create.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2beta1.Version}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.createVersion(request);
-   */
   createVersion(
     request?: protos.google.cloud.dialogflow.v2beta1.ICreateVersionRequest,
     optionsOrCallback?:
@@ -632,6 +632,33 @@ export class VersionsClient {
     this.initialize();
     return this.innerApiCalls.createVersion(request, options, callback);
   }
+  /**
+   * Updates the specified agent version.
+   *
+   * Note that this method does not allow you to update the state of the agent
+   * the given version points to. It allows you to update only mutable
+   * properties of the version resource.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {google.cloud.dialogflow.v2beta1.Version} request.version
+   *   Required. The version to update.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent/versions/<Version ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
+   *     ID>`
+   * @param {google.protobuf.FieldMask} request.updateMask
+   *   Required. The mask to control which fields get updated.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2beta1.Version}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/versions.update_version.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Versions_UpdateVersion_async
+   */
   updateVersion(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateVersionRequest,
     options?: CallOptions
@@ -663,33 +690,6 @@ export class VersionsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Updates the specified agent version.
-   *
-   * Note that this method does not allow you to update the state of the agent
-   * the given version points to. It allows you to update only mutable
-   * properties of the version resource.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {google.cloud.dialogflow.v2beta1.Version} request.version
-   *   Required. The version to update.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent/versions/<Version ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
-   *     ID>`
-   * @param {google.protobuf.FieldMask} request.updateMask
-   *   Required. The mask to control which fields get updated.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Version]{@link google.cloud.dialogflow.v2beta1.Version}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.updateVersion(request);
-   */
   updateVersion(
     request?: protos.google.cloud.dialogflow.v2beta1.IUpdateVersionRequest,
     optionsOrCallback?:
@@ -733,6 +733,27 @@ export class VersionsClient {
     this.initialize();
     return this.innerApiCalls.updateVersion(request, options, callback);
   }
+  /**
+   * Delete the specified agent version.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.name
+   *   Required. The name of the version to delete.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent/versions/<Version ID>`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
+   *     ID>`
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
+   *   for more details and examples.
+   * @example <caption>include:samples/generated/v2beta1/versions.delete_version.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Versions_DeleteVersion_async
+   */
   deleteVersion(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteVersionRequest,
     options?: CallOptions
@@ -764,27 +785,6 @@ export class VersionsClient {
       {} | null | undefined
     >
   ): void;
-  /**
-   * Delete the specified agent version.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.name
-   *   Required. The name of the version to delete.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent/versions/<Version ID>`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent/versions/<Version
-   *     ID>`
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is an object representing [Empty]{@link google.protobuf.Empty}.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#regular-methods)
-   *   for more details and examples.
-   * @example
-   * const [response] = await client.deleteVersion(request);
-   */
   deleteVersion(
     request?: protos.google.cloud.dialogflow.v2beta1.IDeleteVersionRequest,
     optionsOrCallback?:
@@ -829,6 +829,34 @@ export class VersionsClient {
     return this.innerApiCalls.deleteVersion(request, options, callback);
   }
 
+  /**
+   * Returns the list of all versions of the specified agent.
+   *
+   * @param {Object} request
+   *   The request object that will be sent.
+   * @param {string} request.parent
+   *   Required. The agent to list all versions from.
+   *   Supported formats:
+   *   - `projects/<Project ID>/agent`
+   *   - `projects/<Project ID>/locations/<Location ID>/agent`
+   * @param {number} [request.pageSize]
+   *   Optional. The maximum number of items to return in a single page. By default 100 and
+   *   at most 1000.
+   * @param {string} [request.pageToken]
+   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {object} [options]
+   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
+   * @returns {Promise} - The promise which resolves to an array.
+   *   The first element of the array is Array of [Version]{@link google.cloud.dialogflow.v2beta1.Version}.
+   *   The client library will perform auto-pagination by default: it will call the API as many
+   *   times as needed and will merge results from all the pages into this array.
+   *   Note that it can affect your quota.
+   *   We recommend using `listVersionsAsync()`
+   *   method described below for async iteration which you can stop as needed.
+   *   Please see the
+   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
+   *   for more details and examples.
+   */
   listVersions(
     request?: protos.google.cloud.dialogflow.v2beta1.IListVersionsRequest,
     options?: CallOptions
@@ -860,34 +888,6 @@ export class VersionsClient {
       protos.google.cloud.dialogflow.v2beta1.IVersion
     >
   ): void;
-  /**
-   * Returns the list of all versions of the specified agent.
-   *
-   * @param {Object} request
-   *   The request object that will be sent.
-   * @param {string} request.parent
-   *   Required. The agent to list all versions from.
-   *   Supported formats:
-   *   - `projects/<Project ID>/agent`
-   *   - `projects/<Project ID>/locations/<Location ID>/agent`
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By default 100 and
-   *   at most 1000.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
-   * @param {object} [options]
-   *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
-   * @returns {Promise} - The promise which resolves to an array.
-   *   The first element of the array is Array of [Version]{@link google.cloud.dialogflow.v2beta1.Version}.
-   *   The client library will perform auto-pagination by default: it will call the API as many
-   *   times as needed and will merge results from all the pages into this array.
-   *   Note that it can affect your quota.
-   *   We recommend using `listVersionsAsync()`
-   *   method described below for async iteration which you can stop as needed.
-   *   Please see the
-   *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
-   *   for more details and examples.
-   */
   listVersions(
     request?: protos.google.cloud.dialogflow.v2beta1.IListVersionsRequest,
     optionsOrCallback?:
@@ -1006,11 +1006,8 @@ export class VersionsClient {
    *   Please see the
    *   [documentation](https://github.com/googleapis/gax-nodejs/blob/master/client-libraries.md#auto-pagination)
    *   for more details and examples.
-   * @example
-   * const iterable = client.listVersionsAsync(request);
-   * for await (const response of iterable) {
-   *   // process response
-   * }
+   * @example <caption>include:samples/generated/v2beta1/versions.list_versions.js</caption>
+   * region_tag:dialogflow_v2beta1_generated_Versions_ListVersions_async
    */
   listVersionsAsync(
     request?: protos.google.cloud.dialogflow.v2beta1.IListVersionsRequest,
@@ -1024,7 +1021,6 @@ export class VersionsClient {
       gax.routingHeader.fromParams({
         parent: request.parent || '',
       });
-    options = options || {};
     const defaultCallSettings = this._defaults['listVersions'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();