answer: #Person1# calls #Person2# to make sure whether #Person1# can change a shirt for one size smaller. #Person2# says it's okay and reminds #Person1# to bring the receipt.
documents: #Person1#: Hello, I bought a shirt in your shop this morning.
  #Person2#: Yes.
  #Person1#: I bought 1 size too large by mistake.
  #Person2#: Oh, did you?
  #Person1#: I wonder if you could change it for one size smaller.
  #Person2#: Yes, of course. Please bring your receipt when you come.
  #Person1#: OK. I'll come to your place later. Now it is 4:00 PM. How late is your shop open?
  #Person2#: The shop closes at 7:00 PM from Monday to Friday. But today is Saturday, so we will be open until 8 o'clock, sir. We look forward to seeing you.