2.5 Create Amazon Lex Bot

In this section, we will create a simple Amazon Lex bot to receive user input and provide appropriate responses.

Step 1: Edit the trust policy

• Go to IAM Roles and edit the current policy to allow access to Lex V2.
• Click the Trust Relationships tab, then click edit trust policy.
• Replace the old Service section with the following:

"Service": [
    "lambda.amazonaws.com",
    "lexv2.amazonaws.com"
]

• Click [Update Trust Policy] to save changes.

Step 2: Access the Lex Console

• Go to: https://console.aws.amazon.com/lexv2
• Click Create bot

Step 3: Basic bot configuration

Step 4: Language configuration

• Select language English (US).
• Voice interaction: None (we will use Polly separately).
• Click Next to finish.

Step 5: Create Intent and add sample utterances

• In the bot configuration, select language English (US) → go to Intents.
• Click + Add intent → select Add empty intent.
• Name the intent, for example: GreetIntent.
• Add Sample Utterances:

Hello
Hi
Hey there
Good morning

Set up the Response:

Hello! How can I help you today?

• Click Save to save the intent.

Step 6: Build bot language

• Go back to the main bot page, in the English (US) tab → click Build to build the language.
• Wait for the status to change to Built successfully.

Step 7: Create Bot Version

• In the left menu, select Bot versions.
• Click Create version.
• (Optional) Enter a description for the version.
• Click Create.

After creation, you will see the new version displayed as Version 1, Version 2, etc.

Next, assign the version to an alias:

• Select Aliases from the left menu (under Deployment).
• Choose the alias you want to assign the version to (e.g., TestBotAlias).
• Click Associate version with alias.
• Select the version you just created from the dropdown.
• Click Save.

Now on the alias page you will see:

• Alias name: The alias name you set.
• Alias ID: The line showing ID: TSTALIASID – this is the Alias ID, save this value for the next