answer: Jack exchanges his peanuts with #Person1#'s chips.
documents: #Person1#: I've brought some potato chips. Would you like some, Jack? 
  #Person2#: Yes. I'd like to swap some of my peanuts for your chips. 
  #Person1#: That'll be fine. Thanks. 
  #Person2#: Do you have any ketchup? 
  #Person1#: I forgot to bring it, but maybe Mary has some. Let's go and ask her.