I arrived at the Midwest ticket counter, Atlanta Hartsfield, and could immediately tell that she was going to be a problem. Her communication was very direct and authoritive. When I identified myself, she indicated that the flight was full, that there were no seats. That it was too late to get me on the flight. Though I had arrived an hour before departure, at 5:20am, after waiting in line I was just at there 45 minute policy of arriving at the gate. She then entered me in their system as arriving late for the flight and would not put me on another airline which had seats available departing within the next two hours. She insisted that I would have to fly Midwest and the next flight out was 10 hours later. I was put on standby for that flight. It turned out that flight was also overbooked and I was not able to get on that flight. I was informed that I would be rolled over for the next flight. I was informed of an 800 number to call and after being on hold for 20 minutes, I was told there was no help. I ended my vacation plans and went home. I contacted Midwest the next day and was informed that per the report that had been sent to them, that I had arrived 15 minutes before the flight was due to depart. I indicated that was incorrect, and was informed that they had to go by what was on the report that the ticket agent had sent. Not only did the ticket agent have a bad attitude, she had no integrety.