Came in before a concert on a Friday night. Around 6:30p. Didn't want to pay a lot for dinner due to Mandalay Bay being so busy with concerts and comedy shows this particular night. The whole food court was very slow. Chose johnny rockets for a quick bite. Cashier was not very friendly (Maritza). She wasn't friendly with other customers after myself while I was waiting for my food. Ordered the cheeseburger with fries. While sitting at the their seating area where you can see your food cooking, the cashier is telling an employee how to do a task. TELLING her co - worker. instead of SHOWING her. Very rude. When the co worker didn't do the task correctly, Maritza rolls her eyes and says"that's not how you do it. Get the water from over there". Stomps off to shows the employee where to get water for this particular machine. She slams a refrigerator door right in front of where I was sitting. It's not professional to treat other co workers rudely in front of customers. Needs work. Food was great. Good job grill man!