Reluctant Hitman (2001)

A bumbling young man, a beautiful woman, and a case of mistaken identity make a wedding day already full of problems grow worse. While traveling to attend his sister's wedding, Rick Payne meets Candace, an alluring woman with a mysterious past which lead to a mix-up at the airport and Rick being taken to meet the local crime boss who thinks Rick is a famous hitman. To survive Rick plays along and accepts a suitcase full of cash. It is payment to shoot his sister's fiance, Andrew Stone, a cold-hearted tough guy with an evil past. Rick stumbles from one situation to another. He's not ready to be a hitman but does he have a choice? On the wedding day, Candance is in the middle of the action as the real assassin arrives, all hell breaks loose, and it continues, not only as a comedy of mistaken identities but a deadly wedding.