Rather Pissed...
Seriously folks...
When you make a commitment to, or an appointment with somebody, fragging HONOR your words and keep said appointment. Dont, at the last moment (like on the day itself or a few hours before your scheduled meeting) just back out and leave the person hanging.
Its fragging irritating, and causes the other person a certain amount of grief to try and re-do things, all because you suddenly decided you had something else to do.
There are things called schedules, people. Learn to USE them, and be a little responsible with how you manage your time.
If you must cancel or postpone, at least tell the other person some time in advance.
Sheesh!
Rant over.