answer: David tells #Person1# he went on a trip with his family to Europe and #Person1# is happy to give David information about Berlin.
documents: #Person1#: David, what have you been up to lately?
  #Person2#: I went on a trip with my family last week.
  #Person1#: Really? Where did you go?
  #Person2#: We went to Europe.
  #Person1#: What cities did you go to?
  #Person2#: London, Paris and a few other cities.
  #Person1#: Did you go to Berlin?
  #Person2#: No, We didn't go there. I'd like to go there next time.
  #Person1#: I think this summer is a good time to visit Berlin. It's a beautiful place and the people there are very nice.
  #Person2#: That's what I've heard.
  #Person1#: I went there last year. If you want, I can give you some information I have about the city.
  #Person2#: Thanks.