well it is pretty hard to define what is good service for a taxi
ride.
The customer demographic base is so wide,everyone will have
different expectation of what is good service.A form of good
service to someone maybe a form of irritation to another.Eg if a
driver try to be more friendly to their customer,some may like
it,but some will think that it is an irritation and just want the
driver not to bother them but get them to their destination
safely.
How to define what is actually a good service?