You can easily access a client's booking history in 2 ways:
1) In their client profile accesses through the client list:
Click on "Clients" in the left hand menu to open the client list:
Click on the client of interest:
At the top of the client page click on the "BOOKINGS" tab:
Here you will be able to see all the client's previous and upcoming bookings along with any service notes for that booking:
To view the details for a specific booking simply click on that booking in the list
2) By opening any booking for that client:
Simply click on any booking for the client you'd like to view:
Just like in the client profile you can click on the bookings tab to view their booking history.