Few emails, each one useful, each one shows where you are in your trip.
Sample emails with made-up details. Every rider gets the same layout: where you are in the trip, what (if anything) you need to do, and every detail of the booking.
Your confirmation with every detail and the price you paid.
At 6 p.m.: your pickup time, your driver, and how the PIN works.
Only when it happens: the old and the new pickup time.
