Often times our staff will see that the first client doesn't come in until later in the day. With online booking a client can book an early appointment last second, which can make the staff late/unprepared. Our old software system made it so if you were booking for an appointment within 24 hours of that time, you had to call rather than do it online so we have notice. I think online booking is great but if its too short notice it causes a lot of problems. Please consider making a feature that disables online booking for services within 24 hours of booking time!