If you manage your appointments wisely, then you'll keep up with categorizing by status. Once you have marked an appointment as completed, then you have an option to send the client an appointment completed email.
Please note: If you are a TimeTap Professional or TimeTap Business user, you can customize the templates that are sent out to your clients under the Settings menu. We have more information on how to customize your email templates under the settings menu of our documentation site.
The default template for the appointment completed email is printed below: