I'm working as waiter at a restaurant. I want to maximize my words. Is there any other expression of Okay and Sure when I ask something?(order) And when I refill a glass of water or tea customers say thank-you, Is there any other expression besides your welcome? or should I say nothing? Plus, when I refill a glass of water, is this natural to ask you'' would you like more? or would you like more water?'' or is there another expression of it? I have many things to ask about. Thank you so much in advance!