Email your friends is celebrating his birthday you are not able to attend it send him a message by email
Answers
Subject: A very Warm Happy Birthday in Advance!
Dear Friend,
It is useless to state as you are already aware of the fact that you are my bosom friend and the event of your birthday fills my heart with deep pleasure. I also know that a friend is a person whom you cannot forget while celebrating any happiness because he emerges to be your companion through every thick and thin.
Keeping this view in mind, I, direly, apologize for not being able to participate in your birthday celebrations due to some prior domestic engagements. I, myself, become sad on the thought of missing the opportunity of accompanying you on this joyous occasion. However, I am waiting to meet you upon my return to county. Take care of yourself and convey my regards to your parents.
Best Wishes
XYZ
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