Respected Principal,
My name is __________ (name) and I am working as a teacher in your reputed school. I am teaching ________ (class) class of your reputed school.
I am writing this email with the utmost respect to state that I am willing to take casual leave for _____________ (number of days) from __/__/____ (date) till __/__/____ (date) and the reason behind the same is _____________ (mention reason – have to go out of town/ have to prepare for exam/ family issue/ personal reason/ any other).
It is to request you to kindly approve my request at the earliest. I shall be obliged.
Sincerely,
_____________ (Name),
_____________ (Employee ID)