public string CarPickedUp(string bookingId) { Booking booking = r.PickUpCar(bookingId); string response = booking.Id + ", " + booking.RentalCar.RegNumber + ", " + booking.RentalCar.Model + ", " + booking.Renter.FullName + ", " + "Pick-up status: " + booking.IsReturned; return(response); }