Sir/Madam,
My name is Marsal, and currently I'm not on any employment. So you don't need to worry, the job you are asking me to do, will be done as soon as humanly possible. Though I'm not native speaker of English, but I do have a quite understanding about it. And of course, my skill on data entry also good, that's one of the reason why I bid this job.
So, if you don't mind, I would be glad if you can grant me a chance to do this task you asked for.
Thank you
Best regards