As a courtesy, I'd like to let the requester know that the cemetery in question is a considerable distance away from me, so I cannot fulfill the request. I can't seem to find an option to 'reply' in any way.
These photo requests are sent out to multiple people in the area who have been willing to photograph in the past. If you can't do it, there is no problem, as others will also get an email. However, there should be an email listed at the top of these photo requests to reply back.