answer: #Person1# didn't know Ben had a birthday party since #Person1# didn't tell Ben #Person1# has a new e-mail. #Person1# asks Ben for lunch to do something for Ben's birthday.
documents: #Person1#: Wait, Ben, did you say you had a party on Saturday?
  #Person2#: Yeah, didn't you know about it? It was my birthday.
  #Person1#: No, I didn't.
  #Person2#: But I invited you. I sent you an e-mail last week.
  #Person1#: Are you sure? I didn't get it. Oh, you know what? I didn't tell you I have a new e-mail address. Oh, I am sorry.
  #Person2#: That's OK. But I was kind of upset that you wasn't there.
  #Person1#: Really? I was upset too. And the bike trip is just awful. We got lost for four hours.
  #Person2#: Oh, that's terrible.
  #Person1#: Listen, let's go out for lunch this week. I want to do something for your birthday.
  #Person2#: Oh, you don't have to.
  #Person1#: I know. But I want to.
  #Person2#: OK. That's really nice of you, really. So anyway, I have to go now. I have a meeting at 9:30.
  #Person1#: OK. See you later and happy birthday.