Dear Editor,

Though you are not available today for a same-day editing service, I am requesting if you could edit couple of pages by this evening. This is the rest of the statement (Bangladeshi Fulbright) that you edited previously. Since you know the background of this statement, I would like to do the rest with you. 

Would you please let me know your convenience? If you can't do it, also please let me know so that I could find other editor. I have to submit it today. Looking forward your help!
Best regards,