How does Ctrip set up an irrevocable order?

Ctrip can't cancel the order and needs customer service settings. The method is to call Ctrip customer service hotline directly and ask customer service to set up order guarantee. Therefore, Ctrip's setting of non-cancellable orders needs to be set through customer service. Ctrip is an online ticketing service company, established in 1999 and headquartered in Shanghai, China.