CreateChangeOrderReq

{
    "segmentList": [
        {
            "id": 301,
            "newSegment": {
                "departure": "PEK",
                "departureDate": "2026-08-08",
                "departureTime": "08:30",
                "arrival": "SHA",
                "arrivalDate": "2026-08-08",
                "arrivalTime": "10:45",
                "flightNo": "CA1234",
                "isCodeShare": "true",
                "opFlightNo": "CA1234",
                "cabinClass": "economy",
                "cabinCode": "Y"
            }
        }
    ],
    "solutionId": "chg_sol_001",
    "passengerIds": [
        101
    ],
    "changeReason": "voluntarily",
    "fileList": [
        "https://example.com/change-proof.pdf"
    ],
    "reasonDetail": "Customer schedule changed",
    "contactEmail": "zhangsan@example.com",
    "contactName": "Zhang San",
    "contactRegion": "86",
    "contactPhone": "13800138000",
    "externalOrderId": "CHG-EXT-001"
}