France start attacking ships because they are angry over the Jay's Treaty so Americans go to France to tell the french to stop ambushing their ships. Then France tries to bribe the Americans into giving them money.
Give us money!?!
The French refused to talk to the American's unless America was willing to pay.
The Americans left without asking their question because, if they were to ask it they would have to pay money.
The American's get on their ships and return to America.
The American's returned back to the U.S disappointed in themselves and their journey to France.
The names of the french agents were kept secret, so they were called X,Y, and ,Z so in conclusion the incident is known as the XYZ Affair.