What is the service of catering with three lightness, four diligence and five tones?

In catering service, three lightness and four diligence refer to walking lightly, speaking lightly and operating lightly; Hands, feet, mouth and eyes.

Five tones of polite service attitude: 1. Customers are greeted when they enter the store.

2. When the customer asks, there is a "sound".

Customers have a "thank you" for their help.

4. Have an "apology" for poor care.

5. There is a "sound" when the customer leaves.