I received your message and will make sure to return your document in the format you requested. 
I had an unexpected family emergency today and unfortunately was not able to put the work into editing your paper that I needed to. I am afraid that I will not complete the edit by the deadline you requested. 
I am very concerned about the negative impact this will have on you and am deeply sorry for any trouble this causes you. 
I understand if you wish to choose another editor.