Google Duplex is the new technology developed by Google to automate the following user tasks for your site visitors:
Purchase movie theater tickets for users on your website.
Help users with an optimized and automated checkout experience on your website.
Help users place food orders.
Help users check-in to their flight.
Automate changing site passwords using Google Assistant.
To enable it, you can open the Duplex on the Web settings page for your property and click Enable (if not already selected). Google will notify you when your request to enable serving has been processed and the Duplex on the Web has begun training against your site.