How to deal with those importunate customers?

Whether you promise or refuse customers, you should smile and have a calm tone. After being rejected many times, the guests will naturally stop making things difficult. If there are still guests swearing, our service staff should maintain their quality, which will make us more cultured. On the contrary, it will also show the quality of the guests. Naturally, you don't have to get angry afterwards. You can't get angry with people who have no quality.