谢谢 这句的英文翻译亚 比较急

Currently, Air China's booking office said they have tickets from Beijing to Switzerland for May First and May Third, but it is for class Y (High priced Class). Your present booked ticket for CA933 on May Fifth is class M, if you need to rebook it to May First's High priced Class ticket, you need to pay a total of RMB 4500 price differences.