answer: #Person1# wants to invite Jack to attend #Person1#'s birthday party on Friday night, but Jack will be busy and cannot make it.
documents: #Person1#: Hi, Jack, are you doing anything on Friday night?
  #Person2#: Hmm, Friday night?
  #Person1#: Yes, the day after tomorrow.
  #Person2#: Let me think. Well, I have an appointment with Professor Smith in the morning. And I will attend a lecture in the afternoon. And, oh, yes, my brother just called to say he would fly here that night. I told him I would pick him up.
  #Person1#: Oh, that's too bad.
  #Person2#: What's the matter?
  #Person1#: Well, it's my birthday. I'm having dinner with Joyce and I thought I'd invite more friends and make it a party.
  #Person2#: See, I'm really sorry, but I won't be able to make it.
  #Person1#: I'm sorry, too. But that's OK.