Yes, select the booking in the day or week calendar view and choose the “No Show” slider below the client name.  

This will flag the client as a no show and the booking will remain in the calendar with a strikethrough as a visual reference and a remark will be added to the client notes.  Selecting an appointment in the day or week view and choosing “Stats” in the appointment info window will display a client’s number of current no shows. 

Note: All future appointments for that client will appear faded to indicate the no show status.  To remove the status, simply reverse the no show appointment by sliding the “No Show” option to grey.  The client note will remain unless manually deleted, which will also remove the red banner notice.