Dear {Name},
I feel like such a jerk. You were relying on me to {reach destination/meet deadline} and thanks to my {confusion/ineptitude/problem}, you were late. This is totally on me, and I hope it hasn't harmed our {friendship/business relationship}.
Please let me know if there is anything I can do to help ease the impact of the lateness I caused. I'd be happy to {talk to person/reimburse costs}. Just let me know. I am so sorry.
Sincerely,
{Name}
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