Hello! I noticed that you rated the edit I provided for you with a very low score. 

I'm very sorry to find out that you were unhappy with the work I did for you. I would be interested in finding out if there was something particular that you found unsatisfactory, or if you were just generally displeased with the service I provided. 

Is there any way I can remedy this by hearing your feedback and then perhaps looking over your document again (at no cost, of course)?