Dear Mr.XX,
I really desire to show you how happy the days that I have spent for the last more than 3 months at xx Company.I enjoyed working with the colleagues and I have also learned much here.but for some personal reasons,I am sorry to say I will quit the job.
It's so difficult for me to make the decision for the life here is interesting and enjoyable.But I would like to take a new challenge to start something else,which is the kind of life style I am seeking for all the time.I would therefore appreciate it if you would accept my resignation effectively from 4 Jan,2008.
It would be very kind of you to give me a reference letter before my leave.Thank you so much for all that you have done for me.
Yours sincerely,
xx