https://www.cnet.com/news/google-duplex-assistant-is-coming-to-more-states-and-restaurants/

The Google Assistant feature is designed to sound just like a person and is used to call restaurants and stores to set up appointments and reservations.The states: 

The states not included are Indiana, Kentucky, Louisiana, Minnesota, Montana, Nebraska and Texas.Google debuted Duplex during its developer's conference last May and rolled it out to Pixel phones last November after a limited beta test in June. The voice assistant was originally piloted in select cities including New York, Atlanta, Phoenix and San Francisco. Duplex's realistic speech patterns raised ethics questions about people not being able to tell if they're chatting with a machine. Google said Duplex would have a disclosure built in, telling recipients from the start that they're talking to a robot. Duplex works by telling your Google Assistant to book a table at a restaurant or make a reservation. The assistant calls the restaurant on its own, sets up the appointment if it's available, then adds it to the user's calendar.