This letter is an example of a Letter Of Apology and includes all of the elements of a perfect Letter Of Apology for you to use. This sample Letter Of Apology can be used as a template for your needs.
I want like to apologize for missing our scheduled appointment last Saturday. My phone battery died unexpectantly so I couldn’t call you in advance to cancel. I will call you next week to reschedule our meeting, probably around the first week of the coming month.
Again, my sincerest apology. It won’t happen again, I assure you.
Thank you for understanding.