China Southern Airlines Shuangcheng Tourism does not give inquiries and exchanges.

Not within the validity period. Passengers who purchase China Southern's "Twin City Travel" products can use China Southern's APP to exchange economy class round-trip air tickets between airports in two designated cities in China for an unlimited number of times during the validity period, and stop handling this business before the validity period. China Southern Airlines' trip to Twin Cities is not within the validity period, so no inquiry and communication will be given. The product rule of "Twin City Travel" is to provide passengers with limited but unlimited flight rights between two designated airports in China.