Hello [person name],

I appreciate your help in advance and apologize for the short notice. I am writing to ask for your assistance with my essay, which is due by tomorrow. Would you be able to help me out?

Thank you,
[my name]
Hi [person name],

I'm emailing you to see if you could please help me with my essay. It's due tomorrow and I didn't have time to finish it! Is there any chance you could help me out?

Thanks,
[my name]
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