_________ (Mention recipient details)
Date: __/__/_____ (date)
Subject: Apology for missing meeting held on __/__/____ (meeting date)
Through this letter, I would like to apologize for missing the meeting held on _____ (date) at ______ (time).
I know that I should have been present for the meeting but due to the reason, _______________ (mention reason – was outstation/ was busy with office work/ unaware of the timing/ any other) I failed to be present in the meeting.
I promise to join the future scheduled meetings. Furthermore, I would again say sorry for the same.