"Oh good. I'm never sure what sounds normal or not. Conversations are a bit hard when you have no memory of ever having one."

Which is why if you observed Chell you could notice that she tended to take cues from the person she was talking to. More upbeat with more upbeat people, more direct with more direct people...etc.

"Oh it could be much worse. At least whoever built the thing had some idea of safety in mind."