answer: #Person2# helps #Person1# to check out, and #Person1# pays by cash.
documents: #Person1#: Hi, I want to check out. 
  #Person2#: Okay. Come with me. 
  #Person1#: Can I pay by a credit card? 
  #Person2#: Sorry, you can only pay cash. 
  #Person1#: OK. Here is the money. 
  #Person2#: Here's your change. 
  #Person1#: Would you wrap it for me? 
  #Person2#: Of course, I'll get right on it.