It is rude to cancel a date on short notice.
Tim scheduled a date with Tina a week from now, but later figured out he is busy that day.
Tim wants to formally cancel his date with Tina.
Tim lets his date know a week ahead of time that he cannot attend the date.
Tim waits until three hours before the date to inform Tina he can't come.
Tina is happy with Tim for letting her know, and they have a conversation about other things.
Tina feels betrayed by Tim and decides to break up with Tim.