I mostly deal with intoxicated individuals so your milage may vary... I personally think that using their name is a huge part of it, not just to attract their attention but it also makes them feel memorable. For one people like to hear their name and will look to where they heard it. Second, people like to be remembered, by using their name you are telling them you remember them. So don't forget their name and literally go "hey Frank" they will look up haha