How do I reschedule or cancel it? Visit the Quest Schedule Appointment page, where you can reschedule or cancel an appointment using any of the following methods: • If you know the appointment confirmation code, select change or cancel, enter the confirmation code, and then follow the prompts. Rescheduling time period Using the time period option, you may specify custom policies to allow reschedule with an advance notice. For example, rescheduling must be done at-least 1 day before the scheduled time so that the business can better plan their schedule and staffing needs on particular days.