How about a smile while introducing yourself to your customers.Secondly,get to know ( thats very good sonia, mein chali mein chali, sorry for the side track ) your customers a little more by some chit chating.Thirdly, once the food is served don't just disappear but make a few return visits and asking the customers if there is anything that he or she can do to make their dinnig experience more pleasurable.