how to write a request letter for the absent days

can u please help me to write a perfect request letter,please correct all necessary fields


To,

The center head
AA institute
Sub:(compensation of classes and attendance)

Respected Sir,
I request you to kindly compensate the lessons and
attendance as I was absent from dt.17.06.08 to dt.20.06.08 & dt.23.06.08
to dt.24.06.08 due to my grandfather's ill & serious conditions in the hospital,
I was unable applying a leave letter.
So,I am requesting you to kindly allow me joining my lessons,
For which I'll be grateful to you.
Thanking you,
Your obedient student
my name
roll no