Please pay me, don't cancel when I am en route, keep my car nice and clean. 

In return I promise to pick you up at the correct time at the correct place and drive you to your destination in a rather nice vehicle.

However, this promise will not apply in the event of the occurrence (certified by Public Health Scotland) of a widespread viral infection transmitted via bites or contact with bodily fluids that causes human corpses to reanimate and seek to consume living human flesh, blood, brain or nerve tissue and is likely to result in the fall of organized civilization.