Dear Sir/Madam,
It's my pleasure to submit this proposal.
I believe what I saw in the job detail is what my ability fits, so I'm ready to use my ability to help you finish this work. I've been a part-time virtual assistant for a long time, and for I'm a native Chinese, I think it would be easier than you think.
And it will be my pleasure if we can have further collaboration.
Please let me know more details about this job.
Best wishes.