Team When the CANCEL shortcode is inserted in to the email

Hello Team
When the CANCEL shortcode is inserted in to the email confirmation text, end user received within the email sent, a URL that they can click on. When they click on it, it brings them to a blank page on the site.

Questions:
1. Does the shortcode always present a static url?
2. If static, how can I embed the url within a word within a sentence so that it is more readable and presentable to humans, e.g. "To cancel and reschedule your appointment, click here" where the word "here" is clickable to the url
3. Can a specific blank page be selected so that it also presents user with the appointment page to perhaps reschedule?
4. Is there a way to show some text indicating that the appointment is indeed canceled, versus a blank page?
Thanks
William