我提供一个，根据自己的情况改吧

Dear Sir or Madam,

I have learned from an advertisement that your company is in need of a secretary. I would like you to consider me for the position.
My name is Li Min. I am twenty-three years old. I am studying business management in Xiamen University. I will graduate this summer. I am familiar with computer operation and officesoftwares, which can help me do the office work very well. And I have learned English for ten years.In the past two years, I have been an editor for the English Paper of my department. My grades come out top in my department. What's more, I like office work very much and I also think that I can be competent for the job.If I could have the opportunity to get the job I will be quite appreciative.
Thank you for your consideration. I look forward to hearing from you.
Yours faithfully
Li Min
亲爱的先生或女士：
我从一则广告上得知你们公司需要秘书。我希望您考虑一下我。
我叫李敏，23岁，现在在厦门大学学习经济管理，今年夏季即将毕业。我精通计算机操作及办公软件的使用，这可以帮助我做好办公室工作。我学了十年英语。在过去的两年里我一直担任本系英语报的一名编辑。我的成绩在系里名列前茅。另外，我非常喜欢办公室工作并且我也认为我能胜任这个工作。如果我能有机会得到这份工作，我会非常感激。
谢谢您的考虑。我盼望着您的回信。
您忠实的朋友 李敏