It is Saturday morning at a youth soccer game in Canton. A parent on the sideline finally has a minute to set up the job they have been putting off. Your office is closed until Monday, there is no way to book on your site, and by halftime they have booked somewhere that let them pick a time.
With online booking set up right, that parent taps a button, sees the times you actually have open, picks one and gets a confirmation before the second half starts. The booking lands in your calendar or software with the details you need, and reminders go out on their own.
Monday starts with jobs already on the board. Your phone still rings, but less for simple scheduling, and the people who prefer to book themselves finally can.