Someone will contact me after booking the ticket, will send me the ticket code, and then say that the class is the lower class, you can upgrade to the second floor, add 30 yuan per person, if you want to upgrade, you can directly add WeChat to her to transfer money, and then you can also choose the location. When I booked the ticket, I saw the introduction that it was randomly out of the seat or The class is here, why there is a service fee for private transfer money, I don’t understand