answer: #Person1# invites Ann to a concert, but Ann's busy tonight. Ann will pick up #Person1# tomorrow when Ann gets back.
documents: #Person1#: Ann, are you doing anything tonight?
  #Person2#: Yes, I'm afraid I'll be busy tonight, I have an appointment with Professor Smith.
  #Person1#: Well, how about tomorrow? Maybe we could go to a concert?
  #Person2#: Tomorrow, I will take one of my friends to Heathrow Airport, she's going to America.
  #Person1#: That's too bad.
  #Person2#: I will pick you up when I get back and we can go to the concert together. What do you think?
  #Person1#: Great I'll book the tickets right now.