If a passenger wants to change the date of their flight ticket， but the new date has a higher fare， you should say：

If a passenger wants to change the date of their flight ticket， but the new date has a higher fare， you should say：
A.You have to pay the difference. No negotiation.
B.I'm sorry， there will be an additional fare for the new date. Let me calculate it for you.
C.Too bad， that's your problem.
D.Just cancel and re-book.
正确答案：B
试题解析：当乘客想更改机票日期，但新日期票价更高时，客服人员应礼貌地告知乘客新日期会有额外的票价，并主动为其计算差价。