When a person starts a new conversation with your bot, you can set expectations with a get started flow to kickoff the experience.

To create your conversation trigger, simply navigate to your account’s Triggers page and click “Create Trigger”

Then, click the ‘Start a flow when a conversation is started by a contact’ trigger:

You’re ready to create your trigger: 

Note that channel references the page your bot is attached to, while flow represents the flow you’d like to start when a contact initiates contact with your bot.