Dear Sir/Madam,
I am English - born and raised, with Certification in British and American English too. With my impeccable attention to detail I can ensure that you data entry needs will exceed your expectations. I will aim to complete your job within 5 days, but hope to impress you by completing it in a shorter time than this.
I would love to hear more information about the project that you need completing, and look forward to hearing from you.
Kind Regards,
Rosie