answer: #Person2# asks #Person1# to pay for the room service but #Person1# says #Person1#'s already paid.
documents: #Person1#: Well, we didn't ask for this room service maybe someone else ask it, I'm sure.
  #Person2#: Oh, is it? Let me check.
  #Person1#: Yes, please.
  #Person2#: I'm sorry to say this room charge is yours.
  #Person1#: We paid for the room service already in our room.
  #Person2#: Do you have any evidences?
  #Person1#: No, we got no receipt, and we pay it on the spot!