Dear sir/madam,
An Application for the post of an office Assistant
Sequel to your company's advertisement on the A-one website on the above subject, I humbly apply to serve under the capacity of the above stated work designation.
With my little experience from classroom teaching and authorship endeavor, I strongly hold the confidence that I can serve competently, reliably and with some optimum commendable capacity in my endeavors working with you.
I will owe my gratitude to the Almighty and to you sir if  granted a favorable considerations.
Looking forward to working with you.
Yours faithfully,
Goodluck osiah