There are two ways to book the service, one is to use ASAP booking and other is Advance Booking. Advance booking is the thing where your booking goes into the system and offered to drivers 2 hours before your trip. That is how you get the guarantee of Service. If you use ASAP booking then chances are that all our drivers are already on the journey and they will not be offered a job unless they complete the current job and become vacant, therefore you are unable to get the driver on ASAP request and we were really struggling to service all the bookings. Due to the amount of traffic our app was generating we have turned all the booking into Pre-Book only so we can serve you better. 

To get the guaranteed service you must book 2 hours in advance.