Dear Hari,
Thank you for inviting me to your birthday party. I regret to inform you that I can’t join your celebration due to a prior commitment.
Let me explain. I have always wanted to visit Darjeeling and it’s my most favourite place. We have planned a 5 days trip to Darjeeling with family and we are starting on the day of your birthday. I really wish to be with you on your special day and to make it up, I have a surprise for you which you will receive on your birthday.
We shall meet up in our regular spot upon my return and celebrate once again. Sending you my advance wishes.
With love,
K
