Routes for reminders
Not a lot to review,

obviously the most repeated part of your code is appointment_reminder_responses, if you create a variable called root and then built your routes with concatenations like 
root + "/confirmation_thanks" then that would be a good start.

Furthermore you create a function that takes a string and modifies so that 
"xxx/zzzz/yyyy" becomes "xxx/zzz#yyyy" and use that function for the first 2 routes.