Client      BaseTarriff     BaseTariffDetails

ClientId    TarriffId       TarriffDetailsId
            ClientId        TarriffCode
                            TarriffId

$models = Client::model()->with('tarriff')->findByPk(1);

$model->tarriff->baseTariffDetails->TarriffCode;

Client
    'tariff' => array(self::BELONGS_TO, 'BaseTariff', 'TarriffId'),

BaseTarriff
    'baseTariffDetails' => array(self::HAS_MANY, 'BaseTariffDetails', 'TarriffId'),

$reservation = Reservation::model()->searchTrack($track->number);
 $reservation->status;
 $reservation->number;

$reservation = Reservation::model()->searchTrack($track->number);

   foreach ($reservation as $key => $value) {
         $value->status;
         $value->number
         }