public IHttpActionResult GetAllFlightsVacancy() { FCS = FlyingCenterSystem.GetFlyingCenterSystemInstance(); IAnonymousUserFacade anonymousFacade = FCS.GetFacade(null) as IAnonymousUserFacade; Dictionary <Flight, int> flights = anonymousFacade.GetAllFlightsByVacancy(); if (flights.Count == 0) { return(NotFound()); } return(Ok(flights)); }