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My friend invited me to dinner, but I didn't go. How should I write an apology message?

In fact, this matter should ask you to explain why you didn't go to the appointment because of something, or why you didn't attend something very important. Later, I apologized and said that I would invite you to dinner one day and make amends for you.

If you send a text message, you can also simply say it as above. The most important thing is to let him know that you really have something to do. Finally, you should sincerely apologize and say some polite words.