No flight to Beijing that day. Yes, you can make the next day. On Sep 7, there are five flights from beijing to Lijiang, only one of them are direct (the other four will make stops over Chongqing, Chengdu or Kunming). Of course the direct flight is expensive. China Eastern airlines has much cheaper flights from Beijing to Kunming. Then you can take bus to Lijiang then. you can book the ticket through website of airlines. And if you get to Kunming first, you can leave just in the same day as your arrival in Beijing.