answer: #Person1# missed a train but #Person2# tells him he can take another train without extra charge.
documents: #Person1#: Can I still catch T107 for Xiamen?
  #Person2#: Sorry, sir. The train has already left.
  #Person1#: That's too bad. Can I take another train?
  #Person2#: Yes. Your ticket is valid for three days.
  #Person1#: That's great! I will take the next train.
  #Person2#: You have to have your ticket checked.
  #Person1#: Shall I pay extra charge?
  #Person2#: No extra charge at all. But your berth will be invalid.