Back in May, at Google’s I/O Developer Conference, the company demonstrated its new Duplex system, an AI-powered virtual assistant that makes phone calls to organize your schedule for you. The audience watched a recording of Duplex making bookings at a restaurant and hair salon. They laughed in surprise when it ‘mmm-hmmm’d its way through the conversation, apparently convincing the person on the other end of the phone that they were, in fact, talking to a fellow human being.