Last night, a customer was leaving the restaurant after dining, when the server who has worked for you for 10 years ran after them. When the server caught up with them, he/she handed the cash tip back to them and said, "Here you must need this more than me." Obviously, it was a very poor tip. The customer calls the restaurant the next morning and tells the manager the story. The Customer demands that the server be fired. YOU ARE THE MANAGER. What do you do?