Dear {Name},
I am so sorry to have kept you waiting yesterday. Our meeting was important to me, and there is no excuse for my oversight. I read my calendar wrong, and as a result you went out of your way for nothing.
I hope that you will consider rescheduling. I'd like to meet at your convenience, at a location closer to your office. Perhaps you can get away to The StakeHaus for lunch? The meal would, of course, be my treat.
Please let me know what time might work for you. I will be certain to be more mindful of my planning process this time, and have already committed to setting an alarm on my cell phone as an extra reminder. I deeply regret having wasted your time.
Sincerely,
{Sender}
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