The "tutorial" of sorts is a few post it notes on the sliding door and the handbook which is in the back half of the booth.
The handbook explains in a bit better detail, but if you scroll the mousewheel up and down while looking at the microphones to speak with them you have a wider variety of options to interact with.
In order to correctly give a ticket out you need to: ask for what movie they want to see, ask for their money, ensure they have money to pay, and give them the correct ticket. If a movie is rated R, you must also check for an ID before handing them the ticket.
Sorry about the confusion!