If there is no booking before yours, you may bring forward the start time of your booking.
Go to Bookings. Then, tap Active and tap your upcoming booking.
2. Tap Edit booking
3. Drag the top of your booking window to an earlier start time
4. Tap Save
5. Tap Confirm
Note: If you’re unable to drag the top of your booking window upwards, it means that there’s already a booking before yours and you'll be unable to change the start time of your booking.