You can create your own versions of the ActiveDEMAND Appointment Confirmation, View Appointment, and Cancel Appointment pages for your account by creating your own Appointment Landing Page Templates.

In your account, create a new template in Assets->Page Template Library.  

Select the existing template that you want to override:

Once you have selected your template, update the template as you see fit. Be sure to reference the appropriate dynamic fields

Once you are ready to go live with your new version, edit the page properties

Set the Page Use:

Once the Page Use is set, the template will be come the standard for your account.