If you booked via the app, you will receive a "Push Notification". We highly suggest having these turned ON in the notification setting of your app as well.
If the booking is created via phone call or website, you will receive an SMS notification about your request.
Once you received another SMS with the name of the practitioner(s) and the exact time he/ she/ they will be there, it means it is confirmed.
You may check also: How do I track the progress of my booking?