I bought the ticket online, but I can't find the order. What should I do?

It's no use having a payment voucher. Tickets are a special kind of goods. The voucher for issuing tickets is: the ticket number. No ticket number, no ticket. If you have a ticket number, you can call the airline or check it on Xintianyou's website. If there is no ticket number, you know which flight you bought. As long as you call the airline in official website and quote the ID number, you can find out whether the ticket has really been issued. Remember it's official website.