First, I went to OCAT to change tickets. Only after I went there did I know that this place is not only a commercial building, but also a comprehensive station of various lines. Because I went there at night, I turned around a few times to find this place. Look at this place at the subway exit, there are instructions, but it takes a few turns to get around. The instructions are complete and the feeling is that the road is too far. In fact, this station is the terminal for the South China Sea Railway to the airport, and the traffic is very large. Run to the South China Sea Railway ticket, before buying online, to exchange entity tickets. Look at the shopping mall is very large, which is accessible in all directions. There is a place in the shopping mall where tickets are exchanged. But unlike the places told before when buying tickets online, the online tells the travel agency that in fact their tickets do not need to be exchanged by the travel agency. Only when I went to the travel agency did I know that I could go directly to the ticket service station of Nanhai Electric Railway. So I went to the service station of Nanhai Electric Railway to change tickets. In the evening, there was no queue, so I quickly changed tickets and asked to choose a flight. So I chose the nearest one and went through the gate with the ticket. Look at the car is very neat, passengers in the carriage get off after entering the station, then the waiter in the carriage wants to clean the body, to see that the carriage environment is actually quite clean, but the waiter still hangs the sign out, the chain buckles, indicating that everyone will wait for a moment. The car is cleaned quickly. After the waiter removes the sign, the passengers can get on. After the seat number is seated, wait for the car to start slowly. The car is very fast. It arrives at the airport in about half an hour. The seats are very comfortable. The hardware facilities in the car are very good and the service is in place. The whole is very satisfactory.