456, X Street, Y Avenue,
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Jack martinez ,
This is to inform you that I have received your request to join the Del Carner Management Training Program. While I am quite pleased to note your eagerness to develop your skills further, I regret to inform you that all slots have already been taken. I have taken note of your interest, though, and will let you know as soon as another round of sessions has been opened. Thank you very much for your understanding.