I'm so sorry I missed our appointment for this morning. I got held up in a faculty meeting and could not break away. I hope you did not wait too long for me to arrive.
Please call me at your earliest convenience to reschedule our meeting. I am available any weekday except Friday from 2 to 4 PM. And because I missed our meeting I am also willing to drop by the office any time Saturday if that works better for you.
Again, my deepest apologies for the wasted time this has caused you today.Sincerely