answer: #Person2# gets interested in the auction after #Person1# tells #Person2# the stamp #Person2# has been looking for is for sale.
documents: #Person1#: But the auction is a blast! And I haven't even told you the best part yet!
  #Person2#: I don't care what the best part is. Whatever you say won't change my mind. I'm not buying anything!
  #Person1#: That stamp you've been looking for is for sale.
  #Person2#: The 1879 Large Dragon? Are you serious? How much?
  #Person1#: Hey! I thought you weren't interested! Sorry, I've gotta go! I'm going to switch over to eBay and see if my bid is still the highest.