If you opted in for appointment text reminders, you could cancel or modify your appointment on Sephora.com, the Sephora app, by calling the store or text message. Your reservation information can be found in your Beauty Insider account on Sephora.com or the Sephora app. Select Reservations > Find the appointment you wish to reschedule or cancel > Cancel or Reschedule it. You would receive a text message confirming your appointment and a reminder 24 hours before your appointment if you opted in for text message reminders. Reply 2 to cancel.