Need to create a booking system

Just brain storming here.
I need to create a booking system, now I can see how to add the events in the calendar, but instead of the events showing I want the available slots showing, for example:

Monday
10am Available - This would be able to be clicked on and booked.
11am Booked - No click on this
12pm Available - This would be able to be clicked on and booked.

etc etc

Does anyone have any idea where to start on this?