ChangeSearchReq

{
    "cabinClass": "economy",
    "passengers": [
        {
            "surname": "ZHANG",
            "givenNames": "SAN"
        }
    ],
    "journeys": [
        {
            "origin": "PEK",
            "destination": "SHA",
            "departureDate": "2026-08-08"
        }
    ],
    "maxResultCount": 20
}