Freakishly realistic telemarketing robots are denying they're robots

The way the bot sounds disappointed/bewildered at the end of the call is absolutely amazing, as is the fact that the telemarketing company also denying that they use robots.

She sounds so sad at the accusation, like she's failed at the game.

I'm interested in what triggers the "laugh" response, it doesn't just appear to be a random "I don't understand", I wonder if it's picking up on the inflexion in the caller's voice and trying to mimic their tone/mood.

"I am a real person, maybe we have a bad connection"