If a passenger wants to change their ticket to a flight with a different class of service and a different airline alliance， you should：

If a passenger wants to change their ticket to a flight with a different class of service and a different airline alliance， you should：
A.That's way too complicated， don't even try.
B.I'll research the availability， fare differences， and any additional requirements for changing to a flight in a different airline alliance and class.
C.Just cancel and book a new ticket on your own.
D.It's impossible to do.
正确答案：B
试题解析：乘客想要改签至不同服务舱位且属于不同航空联盟的航班，这种情况相对复杂。工作人员应积极主动地去研究航班的可用性、票价差异以及改签至不同航空联盟航班和舱位的额外要求等。