When you miss a meeting or appointment with your friend or college , you have to apologize to him/her. You are advised to modify this letter to be suitable for your purpose
Sample of apology letter for missed appointment
I can't tell you how sorry I am for missing our appointment at [location]. Something very urgent came up at the last second. It would be more appropriate if I explain it in person.
I hope I could make it up to you this [date]?
Thank you indeed for your understanding and patience. I look forward to seeing you soon.
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