Under Settings → Location → Waitlist or Bookings you'll find the functionality to add "Geo-fencing" to your waitlist or bookings. 

What is Geo-fencing? Great question. Geo-fencing makes it easy for you to restrict your guests' ability to add themselves to the waitlist or book an appointment unless they are nearby, within the radius you set around your business. You can also specify a different location than your regular business address as the starting point if you want.  

-> Learn more about Geo-fencing here