ADD_ADDON
ADD_ADDON: "addAddOn"
ADD_TRAVELER
ADD_TRAVELER: "addTraveler"
MODIFY_ADDON
MODIFY_ADDON: "modifyAddOn"
PRICE_ADJUSTMENT
PRICE_ADJUSTMENT: "priceAdjustment"
REMOVE_ADDON
REMOVE_ADDON: "removeAddOn"
REMOVE_TRAVELER
REMOVE_TRAVELER: "removeTraveler"