Dr. Renowned Name
XYZ Hospital, Main Road
City, State
Date: March 15\textsuperscript{th}, 2024
To:
The President
Alumni Association
Green School
Subject: Absence from Graduation Ceremony
Dear President,
I acknowledge the honor of being invited as Chief Guest for the Annual Graduation Ceremony on March 24\textsuperscript{th}, 2024. Unfortunately, a prior professional obligation prevents my attendance.
Please extend my sincere congratulations to the graduating students and my best wishes for their future.
Warm regards,
Dr. Renowned Name