If a passenger wants to book a round-trip ticket but with different airlines for each leg， you should：

If a passenger wants to book a round-trip ticket but with different airlines for each leg， you should：
A.Tell them it's not possible.
B.Check the availability and fares of different airlines for each leg and assist in the booking.
C.Only book with one airline.
D.Charge an extra fee for the complexity without explanation.
正确答案：B
试题解析：乘客想预订往返不同航空公司的机票，客服人员应积极协助，查询不同航空公司各航段的座位可用性和票价等信息，帮助乘客完成预订。