Courteously, my name is ___________ (name) and I am working as _________ (designation) in your reputed company. My employee ID number is ___________ (employee ID).
I write this email with the utmost respect to bring in your kind consideration that my sister is getting married on __/__/____ (date) and for which I am in need of leave for ________ (number of days) from __/__/____ (date) till __/__/____ (date).
I shall be highly obliged for your kind support and expect your kind response so that I can plan accordingly.
Thanking you in advance.
____________ (Employee ID),
____________ (Contact details)