Thin so it doesnt stick together

I work in a deli and many times I have had the request of slicing cheese "I want it thin but so it doesnt stick together" ITS IMPOSSIBLE! Why cant you get it through your heads customers. Cheese thin will always stick to one another. Yet time and time again I have to waste my time explaining it and yet the same customers keep comming back asking the same dumb request. If you want it thin deal with the consequenes or get it thick and solve the problem.