Dear {Name},
I am so sorry for bothering you the other day. When I approached you about {topic}, I didn't realize that you were {busy/upset/etc.}.
The issue I had hoped to bring up was {issue}. While the matter feels urgent to me, I should have shown better respect for your time and situation.
I'd appreciate it if you could contact me at your convenience at {contact info}. Alternatively, perhaps you could refer me to {other party}.
Sincerely,
{Name}
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Index of letter of apology templates