Do not allow patients to schedule appointments within 48 hours

Do not allow patients to schedule appointments within 48 hours

Is there a way to ensure that a patient doesn't request an appointment for just a few hours from now? Right now it seems like someone can try to schedule an appointment the night before for our first appointment of the day. Obviously we would not be able to confirm that appointment but it is just setting the client up for disappointment. How do we ensure that the client cannot book an appointment that's less than 48 hours from now?