You can change or cancel your booking right up until the booking starts. The best way to do this is by using the GoGet App, available on iPhone and Android.
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When you edit your booking, you can extend it, change the start and end times, or cancel it entirely. To change to a different car, you need to cancel your booking, then book the other car separately.

You can’t change, shorten or delete a booking if it has already started, even if you recently made the booking.

​For example: if it’s 5.15, and you make a booking from 5:00 to 7:00, you can’t make any changes to the booking after it is confirmed. You can always extend your booking.