Respected,
Most respectfully, my name is _________ (name) and I am working as __________ (designation) of your reputed company i.e. __________ (company name). My employee ID __________ (mention your employee ID).
I am glad and excited to inform you I am getting married on __/__/____ (date) for which I am writing the email in order to request you for sanction leave in my name for _______ (number of days) days from __/__/____ (date) till __/__/____ (date).
I believe that you will help me out by sanctioning leave for the said dates. I shall be highly obliged for your kind support.
Thanking you,
Sincerely,
_________ (Your name),
_________ (Employee ID),
_________ (Contact details)