Hear Google's virtual assistant mimic a human voice to book an appointment by phone – video

Google's CEO, Sundar Pichai, introduces a new robotic assistant in his keynote address to Google's 2018 conference in California on Tuesday. The virtual assistant, powered by Google Duplex, uses a very natural speech pattern that includes interjections such as 'er' and 'mmm-hmm' so that it sounds eerily lifelike.

• Google's robot assistant now makes eerily lifelike phone calls for you