There are four friends at a restaurant. It is 8:25 p. m. They, re waiting (等待) for a fifth friend. The friend is late. They want to know if he will say "sorry" for being late. After 5 minutes, he arrives.
However, he doesn't say "sorry" when he arrives. To their surprise, he only says, "Hey, thanks for waiting." The others say, "You're welcome." and they feel it is fine, then they open the menu and start to order food.
________Sometimes we should say "thank you", not "sorry"'. For example, you are feeling sad about something, and you're talking about it with a friend for a long time. You may say "Thank you for listening", but not "Sorry for talking too much". Sometimes, "thank you" can sound better than "sorry".