Dear Sir/Madam,
I believe I am the perfect choice for your project, since, not only am I a native Greek speaker, but I am also more than adequately fluent in English, as I live in USA.
Furthermore, because of my profession as an electrical engineer, I am an excellent user of Microsoft Office and Excel, as I use Excel files with a lot of data on a daily basis.
Kindly asking for a response.
Yours faithfully,
Yiorgos