Dear Sir/Madam,
I am ______ (your name) working in ______ (department) as _______________ (designation) having employee ID ________ (employee ID number).
This is to inform you that due to ________ (mention reason for leave), I will not be able to come to work on __/__/____ (date). It is very urgent work and cannot be deferred. I request you to kindly provide leave approval.
Thanking you in advance.
Yours Sincerely,
___________ (Your Name)
___________ (Your Designation)
___________ (Your Employee ID)
___________ (Your Contact Number)