Respected Sir,
This is to inform you that I have decided to put in my papers once and for all. Since I cannot recall the last time I was even nominated for a promotion, let alone obtain one, it horrifies me that I have stuck to this office as long as I have done. I hope you shall understand that although I am not particularly talented or clever, I really have more self worth than is obtained by bringing your coffee all day. Thus my absence really should not cause you great displeasure; maybe only a slight delay in your morning coffee.
All my dues have been cleared, thank you very much. I hope the company runs without my delightful presence and I can only wish my successor my very best wishes. I hope it does not take her too long to figure out your caffeine requirements, difficult to remember as they are.
Thanking you,
Natasha Nussbaum