The restaurant can return the dishes in the following ways:

1. The customer cancels: (After the waiter confirms the menu to the guest, the cashier has delivered the dishes that the guest requested to cancel before the kitchen produced them)

2. The guest changes the dishes: (After the guest orders, the guest requests to change the dishes before the kitchen produces them. This phenomenon indicates the name of the replaced dishes and drinks in the return table)

3. Selling: (Temporary selling caused by inadequate preparation by the kitchen department during the meal)

4. Disrupting due to the waiter's mistake: (Long-term selling has been suspended but it was ordered, the wrong station number was written, the turntable was combined, and the menu was ordered and returned because it was not confirmed to the guests)

5. Dishes quality problems. Foreign objects)

6. Too slow: (urging food for more than one time or delaying it for 7 minutes (afternoon market) and 11 minutes (evening market)

7. Transmission error: (wrong station, omission, repeated quantity, wrong variety).