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

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.