answer: #Person1# wants to refund the MP4 but #Person2# refuses.
documents: #Person1#: Excuse me, miss. I don't think we need the MP4 any more. We would like to refund it.
  #Person2#: May I see your receipt?
  #Person1#: Here you are.
  #Person2#: I am sorry, sir. You bought it 2 weeks ago, and you can only refund it in one week.