there are some excellent info about end-user contact you in this forum, you might want to do research about it. But for sure you can say "I'm about to turn this domain into a website, but I am willing to sell for the right price,...etc.." and then give them the price you want to sell and/or ask what is their offer for this domain. But before do those steps, make sure do research on GOOGLE base on their email, name to see who they are.