Dear {Name},
I am so sorry for missing my appointment {date}. I {did/did not} receive a reminder {call/postcard}, and in any event I should have been more diligent in tracking my commitments.
I've made a note of my upcoming appointment on {date} both on my calendar in in my phone so this won't happen again.
I know that my absence caused an inconvenience to you and your staff. With that being said, I {describe financial hardship} and am hoping you will consider waiving the missed appointment fee. Thank you so much for your consideration.
Sincerely,
{Name}
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Index of letter of apology templates