public Reservation(
     ReservationId id,
     AccountId accountId,
     EquipmentId equipmentId,
     ReservationDateTime reservationDateTime,
     PurposeOfUse purposeOfUse,
     ReservationStatus reservationStatus)
 {
     Id                  = id;
     AccountId           = accountId;
     EquipmentId         = equipmentId;
     ReservationDateTime = reservationDateTime;
     ReservationStatus   = ReservationStatus.Reserved;
     PurposeOfUse        = purposeOfUse;
     ReservationStatus   = reservationStatus;
 }
 public void ChangePurposeOfUse(PurposeOfUse purposeOfUse)
 {
     PurposeOfUse = purposeOfUse;
 }