answer: #Person1# asks #Person2# about the available seats.
documents: #Person1#: Excuse me, is this seat taken?
  #Person2#: I ' m afraid this seat is taken.
  #Person1#: Oh. is it. Thank you anyway.
  #Person2#: You ' re welcome. Why don ' t you ask the conductor when he comes by?
  #Person1#: Thank you.