Reply #217: Generally you call the company and the driver pays for dispatch service

[LeftyMom]

How the cab is leased can vary, but generally one pays a flat rate to have access to the car either 12 or 24 hours a day and can drive it as much or as little as one likes in that time.

Discrimination rules only involve protected classes. Provided you're not rejecting a passenger on the basis of their skin color, sex, handicap, religion, national origin, or membership in another protected class, you can generally tell them to take a flying leap for any reason or none at all.