Appointments and Cancellations. Our doors are open from 7:15 AM - 5:00 PM. Our phone hours are from 7:45 AM - 4:45 PM. During the hours of 4:00 PM - 8:00 AM our phones are on answering service. To schedule an appointment please call our appointment line: (770) 517-1900 and press 3. Our office hours for appointments are as follows:.