Respected Sir/Madam,
With due respect, my name is _________ (name) and I am studying in _________ (class) class of your reputed school having roll number ___________ (roll number).
I would like to inform that I have to travel to ________ (location) to attend my uncle’s marriage ceremony. In this regard, I will not be able to school from __/__/____ (date) till __/__/____ (date). So, I request you to sanction leave for ____ (number of days) under my name.
I request you to kindly grant me the approval. I hereby ensure that I will complete my classwork and homework at the earliest once I join back.
I shall be obliged.
Thanking you,
Sincerely,
_________ (Name),
_________ (Roll number),
_________ (Contact details)