answer: #Person1# isn't satisfied with a product and requests a refund. #Person2# asks for the receipt, but #Person1# thinks it's lost.
documents: #Person1#: I'm not satisfied with it.
  #Person2#: Why not? What's wrong with it?
  #Person1#: Sometimes it goes fast. And sometimes it goes slow. And the alarm doesn'twork, either.
  #Person2#: Would you like another one?
  #Person1#: No. Can I have my money back?
  #Person2#: Hmm. . . have you got a receipt?
  #Person1#: A receipt?
  #Person2#: Yes. I must see your receipt. You can't have your money back without receipt.
  #Person1#: Oh, I'm not certain, but I think I've lost it.