Personally I pray for healing and if nothing happens ask about issues. I've even had people say they don't want to be delivered of whatever the issue is! Shake the dust... I have also come across folks who once delivered find it hard to move on want to revisit the completed work. I love the fact then when Jesus did these things he invented new methods each time to tell us not to become formulaic but rather be one with the Spirit. The quickest deliverance I ever did was, 'Get out in the name of Jesus.' but of course it wasn't really me.