Busy Saturday night

Some people I don't get. Saturday night is always busy and the corporate front desk helper left me alone with the new gal who will shadow me a few hours. She has no training on our computer and still going through her video training yet. Excuse me, me working a busy night alone and losing my mine is not a good time shadow me. I sent her to work on her video training. She is useless on the front desk computer unless her training is finished. I told the guy arriving after me to clock in cause I needed him. Eventually it slowed down when people went to bed. Then lost internet connection for an hour and major assclown telling me to try harder to check in his family. I can't do anything when the front desk system is down, we don't do paper back up like I did at the Holiday Inn. What part of my computer is down was confusing for him. He even told me all hotels have an emergency room on hold for such an occasion. I never heard of that. We do have emergency keys, but don't know what is vacant without the computer. I even offered another hotel room that we would pay for. First they accepted it, then after I call the hotel and arrange the rooms, he refused to leave the lobby. So computer came back up I had to call the hotel to tell them weren't coming. Earlier I sent someone over cause hotel overbooked us on certain type of room so I knew they had rooms.