Greetings of the day!
I, _________ (your name) working in your company as ________ (designation) having employee ID number ___________ (employee ID number) and I am writing this email to inform me that I will not be attending office for _______(number of days) days as I am not well, I am suffering from ________.
In this regard, I hereby request you to kindly grant me leaves _____ (no. of days). I ensure I will be rejoining from __/__/____ (date) onwards.
Furthermore, I will be available on calls, you may contact me on my contact number. Thank you in advance for your kind understanding and support.
____________ (contact details)