Some auditions are improvisation. Improvisation is when there is no scripted dialogue and you make it up as you go. The casting director will present you with a personality and a setting, and inform you to start. For example, I had an improvised audition wherever I used to be informed I used to be cop and that I used to be operating right after a suspect shouting to use hyperthermic techniques and halt in the name of the law.
Tip#4
Don't take rejection personally. It doesn't reflect your ability in any way at all. It simply means that the judges felt you weren't quite as close to the desired character as some other actor. Soon after every audition look into which sort you felt went well, and what type did not work. Take the time to go over those issues that you underperformed on.