Hand signals will appear every once in a while there will be a hostess saying "Help please!" Select them and you will see her doing a hand signal with options. If you get the hand signal correct you will get a bonus order, the hostess's hp will recover, and the mood will improve. However, if you do not respond or get the hand signal wrong the mood will lower and the hostess will lose hp.

If a girl is twisting something it means she wants a towel

If she holds out 2 hands flat it means she needs a menu

If she holds out an "L" with her hand she needs a guest glass

If he holds out a "C" she wants a Ladies' glass

If she holds her hand upside down with the thumb and pinky out she wants to refill the ice

if she holds her thumb and index finger in a circle she needs to swap the ashtray

Towel

She looks like she's wringing a towel with her hands

Menu

It looks like she's holding out a menu

Guest glass

The guest gets no ladies so hand them the L

Refill ice

Her hand looks like a handle of a bucket

swap ashtray

Her hands make a circle which is the shape of an ashtray

Ladies glass

I couldn't think of anything so just if none of the above match just pick ladies' glass