.In the restaurant
In Korea, when we're going to restaurant just looking the hall and checking the table if it is possible to sit.
But in other countries, before entering the restaurant waiters ask how many people are going to eat.
So before entering the restaurant you have to talk to waiter.
When you receive some kindness from someone you have to respond a smiling face.
When you are in a nervious situation, someone helps you to resolve the problem. After finishing your accidentes you have to respond a smiling face to them. It is etiquette for their kindness. Also we can improve our country image.