Call on the drink server after closing to allow Flo to pick two drinks at a time.

Use the podium in between chains to avoid losing customers that grow tired of waiting for a table.

When you reach level 24 and unlock the telephone you can then choose between three helpers. You can only select one of them. Note: The helpers do things automatically. They know what to do and when to do it.

HELPER - DESCRIPTION
Cleaner - Picks up the checks and cleans the tables.
Bartender - Gives drinks to people when they become impatient at their tables. Note: He is the most helpful helper.
Singers - This posse will play music to entertain people in line.

Get the Bartender as you helper. You call the Bartender you can get drinks any time desired. The drinks do not have to be prepared; they will simply be there.