THEM: hello - i'd like the ball and two books. you can have the two hats.  YOU: i can't agree to that, i would like two books and a hat.  THEM: i can't agree to that. i definitely need the two books.  YOU: i would like a book, a hat, and a ball.  THEM: can't do that either. at the very least, i can do a ball and one book.  YOU: i won't agree to that so i guess we don't have a deal.  THEM: ok, no deal then.  YOU: yep no deal.  THEM: no deal  YOU: no deal.