Dear sir/madam,
I am interested in working on this project. I have experience in Excel spreadsheet. That's why I know I can be of great value to you, when you give me this job.
Since there is no specific information about the content of the job, I'm interested to know what exactly it is about, how much content does it require me to do. Keep in mind that my time estimation might not be accurate. Hope to keep in touch with you.
Regards,
Ognen Trajkovski