How to get conference Unique Id during meeting schedule through EWS Service (("https://outlook.office365.com/EWS/Exchange.asmx")

Hi Guys,

How to get conference Unique Id, The meeting schedule through EWS Service ("https://outlook.office365.com/EWS/Exchange.asmx"). 

Please help me out for this task. thanks advance. 

My Code : 

                ExchangeService service = new ExchangeService();
                Appointment appointment = new Appointment(service);
                appointment.Subject = subject;
                appointment.Body = new MessageBody(BodyType.HTML, body);
                appointment.Start = startDate;
                appointment.End = endDate;
                appointment.Location = location;
                appointment.ReminderDueBy = DateTime.Now;
                appointment.Save(SendInvitationsMode.SendToAllAndSaveCopy);

Thanks

Karthikeyan Palanivel