A Jerk
A "Scofflaw".
travel agent
Box office clerk
To find out if you have an unpaid parking ticket, call your city's traffic department. With your car's license plate number they can tell you if you have any unpaid parking tickets. I know because i had one and that's how I found out. Pretty straightforward and simple.
A person who gives a statement is called a witness.
A mentor
a postman
A person can go to the FlyDenver website and go to the parking section. One can book parking that way online. Or they can call to make the arrangements.
I'd call that a parking garage.
Witness
a parking lot.
A Guidance Counselor.