Dear Mr.Wen：
Ms. Huang Lijia of your company has told me that your dept needs a manager assistant,and I wish to apply for the position. I will graduate from commercial school next month. My outstanding record at school and some experience in business has prepared me for the work you are calling for.
I am really interested in learning business practice,and also a diligent worker and a fast learner. If given a chance, I am sure I can prove my worth in your company.
I will be available during the weekdays in the morning for any interviews you may want to give. Enclosed is my resume,and hoping for your immediate reply.
Sincerely yours,
X,XX