answer: #Person1# wants to study German and #Person2#'s eager to learn Chinese, so they decide to exchange lessons.
documents: #Person1#: Are you an American?
  #Person2#: Yeah.
  #Person1#: Why don't you speak English?
  #Person2#: Oh, my mother is a German, so I can speak German.
  #Person1#: Oh, do you like Chinese?
  #Person2#: Yeah, I'm eager to learn Chinese, but it is too difficult for me.
  #Person1#: I want to study German. Can we exchange lessons?
  #Person2#: Very Good. I'd like to do that.
  #Person1#: When will we begin?
  #Person2#: How about tomorrow night?
  #Person1#: That's all right.