Dear {Name},
I'm so sorry, but I didn't realize that I already had plans for {date night}! I have to {work/babysit my nephew/honor my plans with a friend/etc.}, and I completely forgot until I checked my calendar.
I apologize for backing out last minute. I was really looking forward to seeing you, and I'd like to make it happen as soon as we both can. Are you available {date} instead?
Sincerely,
{Name}
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