Dear EditorChief,

I hope you are doing well.
First, I would like to thank your help in stressful week of finals. It was really nice of you. I am looking forward to continue working with you in semesters to come. 
I am now working in my last paper. It is due Friday or Saturday. It is going to be 5500 to 6000 words. I was wondering if you have any free time this week, probably Wednesday and Thursday.  

Thanks again,
Sahar