Dear Ismoil

Dear Ismoil,
I'm writing apologise for missing your birthday party. I can't tell you how sorry I am. I feel terrible at having let you down. I know how much you were looking forward to me that day.
The truth of the matter is that my mother admitted in hospital for the reason heart disease those days. I shocked that event. I'm really sorry not to inform you.
I hope you understand my situation. I promise to you not again repeat in future. Happy birthday to you! I wish you all the best!
Your friend,

Baxodir.