answer: #Person2# wants to swap seats with #Person1# so #Person2# can talk to an old friend and #Person1# agrees.
documents: #Person1#: Excuse me? I think you are in my seat. Look, it says 9B on my boarding card.
  #Person2#: Sorry, but could we exchange seats? This is my old friend. We haven't seen each other for a long time. I really want to sit next to him.
  #Person1#: In that case you can sit here, but where is your seat?
  #Person2#: It's 7A. It's a window seat.
  #Person1#: Oh, that's great. I asked for a window seat. But there were not any left. I really didn't expect I'd get one this way. Thank you.