answer: #Person1# pays for his bill partially with a voucher with #Person2#'s assistance.
documents: #Person1#: How much is the voucher worth?
  #Person2#: It is worth 100 yuan and your bill comes to 230 yuan. The difference is 130, please.
  #Person1#: Here it is.
  #Person2#: Thank you, sir. Could you sign the voucher here, please?
  #Person1#: OK. Here you are.
  #Person2#: Thank you, sir. Hope to see you again soon.