Hainan Airlines has multiple ways to contact their customer service. One can reach out to them through email customerservice@hnair.com , call their hotline 400-898-9898 from Mainland China and 800-830-5900 from Overseas or visit their website for any inquiry get more information through https://www.hnair.com/cn/helpcenter_online.html . One can also contact their customer service team through WeChat. Reach out to the above means to get the necessary assistance.