public void CancelSurgery()
{
Console.WriteLine("Write information about SURGERY.");
Console.Write("Surgery's ID: ");
int surgeryID = Convert.ToInt32(Console.ReadLine());
Console.Write("Surgeon's ID: ");
int surgeonID = Convert.ToInt32(Console.ReadLine());
controller.CancelSurgery(surgeryID, surgeonID);
Console.WriteLine("Surgery has been canceled.");
}