My name is ________ (name) and I beg to inform you that my employee ID is ____________ (mention ID) working as a _______ (designation).
This email is to bring to your notice that I have some urgent work at _________ (home/other) on date __/__/____ (date). So, it would not be possible for me to attend the office on the said date. In this regard, I request you to kindly grant me leave and do the needful at the earliest.
I shall be obliged. I assure you that I will complete all my task before the leave date.
___________ (Contact details)