You can add a link to the reminder message that lets the client confirm their appointment. It all starts from a single switch.
Step 1 — Open the settings
Open the menu and go to Settings.
Step 2 — Turn on confirmation
Turn on the Request appointment confirmation switch. When it's on, the reminder message includes a link the client can use to confirm the appointment.
Step 3 — Save
Tap the Back arrow in the header; the setting is saved automatically.
Optional: the text shown before the confirmation link can be edited in SMS Templates, a section available only to the administrator account.