public CustomerService()
{
reservationService = new ReservationService();
carRentalDbContext = new CarRentalDbContext();
}
/// <summary>
/// CarService constructor, here we inject the reservation service instance and the result instance so we can obtain them faster.
/// </summary>
public CarService()
{
reservationService = new ReservationService();
result = new Dictionary <CarModel, decimal>();
}