Very clever technology. As smart cars can make far better and more consistent driving decisions than chaotic and easily-distracted human drivers, and as AI diagnostic systems can catch things human radiologists and doctors miss, it was only a matter of time before computers would do better than people when it came to generating conversations. Mind you, that's not difficult given so many run along the lines of, "So I was like, you know, and she was like, awesome! and I was, so, whatever, and he was like totally, and then..."