Customer comes to the desk with their demand.
Click the book and the customer will look for it automatically.
If the book is exactly what the customer wants,
Click the customer to give the book to him.
After the payment, click coins to get them.
Customer will be impatient for waiting too long.
Click the recovery port if the customer is gone with angry and nobody wants it.
Put the book into recovery port.
Reading the newspaper can make the customer wait a little longer.
Click the prop cabinet to use props.