public async Task <(bool success, string message)> IsCarAvailable(IsCarAvailableOptions isCarAvailableOptions) { var(success, cars) = await GetAvailableCarsAsync(isCarAvailableOptions.Adapt <AvailableCarsOptions>()); var car = cars.FirstOrDefault(c => c.CarId == isCarAvailableOptions.CarId); if (car == null) { return(false, CarUnavailableMessage); } var employeesOnTrip = isCarAvailableOptions.EmployeesOnTrip; if (employeesOnTrip > car.Seats) { return(false, NotEnoughRoomMessage); } return(true, string.Empty); }