Your e-mail arrived 38 minutes after your appointment was scheduled to begin, so your notice was not so much "short" as it was "late." This is particularly notable in that we were to meet to discuss your academic probation, particularly with regard to time management and your commitment to a college-level education.
I'm sorry to hear that your something came up -- I know how difficult somethings can be, always coming up when you least expect it, and when you have all these other plans that need to be dropped immediately so as to devote all of your attention to the something.
Please call us at ______ to re-schedule just as soon as your something goes down again. Or, if you donut have time, don't worry about it -- what's the worst that could happen?