answer: #Person1# checks if #Person2# has anything unpaid. #Person2# thinks they forgot to demagnetize a pair of sunglasses and shows #Person1# the receipt. #Person1# feel sorry.
documents: #Person1#: Thank you, 175 yuan.
  #Person2#: Here you go.
  #Person1#: Here is your change and your receipt. Do you have goods unpaid on you, sir
  #Person2#: No, I don't think so.
  #Person1#: I'm sorry I need to call the security to have a look.
  #Person2#: There must be a mistake.
  #Person1#: Sorry, sir, it's my job to make sure the goods are paid.
  #Person2#: Wait, can you check these sunglasses I bought it in the second floor. I think they forgot to demagnetize it.
  #Person1#: Sure. Ah. . . That's the problem. Have you paid for it
  #Person2#: Of course I did. Here is the receipt.
  #Person1#: Let me see. . . Oh, I am awfully sorry sir.
  #Person2#: That's all right.