I'm so disappointed staying at this hotel this time. I made 2 different reservations Because decided to stay 1 more night. total of 2 rooms for 3 nights First day check in was ok, the guy very professional and check us in flawlessly for three nights and advice us to come back on the 3rd day only to re-validate the room key. On 3rd day we re-validated the key was served by Aaron. Very rude, unmanned impatient and bad attitude plus st*bb*rn. He could't find my reservation. I showed him my confirmation letter on my phone, he just take a glance and keep looking again at his computer. Keep saying no reservation and blame the 3 Rd party travel agent from my country did not send the reservation to manager. Come in and out front the office but no result. I tried to be patient by writing down in the paper again the confirmation number and my name, to make him conveniently read the confirmation number and guest name, because I believe he's to lazy to read through my phone carefully. Really surprise MGM have this kind of people on the front desk. Shouting to customer. Very rude no manner, very unprofessional Aaron spent 1 hour 10 minutes with no result while waiting for him searching my reservation, my husband queuing again and assisted by a professional, well mannered warm smile man named Leo. After my brief explanation, Leo can find my reservation in 5 minutes. Front desk named Leo have outstanding service, well mannered and respectful person. Five star hotel like MGM should have more people like Leo. I'm sure Leo qualification would be appreciated by many of diamond or five star hotels in world. As for Arron, in my opinion need to be trained before put him at front desk. After Leo done with my reservation, I heard customer, he's a big man, very angry with Aaron and scold Aaron. And I heard Aaron say apologize. this happened at 13.40 pm.