how to say this
When you go to a restaurant, you are a customer or a guest or a visitor in oral English? which one is correct? how do you call the person who serves you? Thanks in advance.

Question

Answer

Hi Rob,

When you go to a restaurant, you are a customer.  Some restaurants will call you a guest, but customer is more common.  We don't say visitor.  If the person who serves you is a woman, she is a waitress.  If he is a man, he is a waiter.

Answer

if a woman serves you, she is a waitress. If a man, he is a waiter. 
You may be called customer, guest or client.