Respected Sir/ Madam,
With due respect, I am __________ (Employee Name), working in department __________ (mention your department). My ID number is __________ (mention your ID number).
I write this email to request for additional responsibilities. Respected, I have been working as _______ (mention your current role) in the mentioned department. I have been working with full dedication for the last _______ (duration) but I believe, with the experience I have gained over the years, along with present work I can also handle the ________ (mention additional responsibility you want) as ___________ (mention reason – why you feel this).
I shall be highly obliged for your kind consideration and quick response.
____________ (Contact details)