Dear Sir/Madam,
With impeccable attention to detail and errors, I think that I would be the best suited candidate to complete your project.
I'm a native English person and as you can see, I have certification for both American and British English. I would like to complete the task of entering data for you - dependent on the content and the topic of the work, I would hope to produce your work within 5 days from receiving it.
I look forwards to hearing from you.
Kind Regards,
Rosie