answer: #Person2# refuses to have thirteen people for dinner on Friday. #Person1# thinks it's an old superstition that thirteen means back luck but agrees to ask #Person1#'s sister to come.
documents: #Person1#: Ok, so who are we going to invite to our dinner party? 
  #Person2#: Well, we have the Thompsons, the Greens, and the Andersons, about twelve people total. 
  #Person1#: Don't forget my friend Andy from the office. He has nothing to do on Friday, so I invited him over. 
  #Person2#: But that makes thirteen people! We can't have thirteen people for dinner on Friday! 
  #Person1#: Why can't we? 
  #Person2#: It's an old superstition. If we have thirteen people at the table, then it means bad luck. Can Andy bring a date? 
  #Person1#: I'm not sure. He just broke up with his girlfriend recently, and I don't think he's in the mood to start again so soon. 
  #Person2#: But we can't have thirteen for dinner! 
  #Person1#: I think you're making a mountain out of a molehill. It's only a superstition. It really doesn't mean anything. 
  #Person2#: Absolutely not! I refuse to have thirteen people for dinner on Friday! 
  #Person1#: Ok, ok. I'll ask my sister to come. That way we'll have fourteen for dinner. 
  #Person2#: That's better.