不要很长，十句左右就行了
追答A.Excuse me,I'm sorry to interrupt you to say that there is something wrong with our train.
B.Really?Does it matters seriously?
A.Don't worry.It is not a great event.We are solving the problem at the highest speed.
B.Then how long do we need to wait?
A.About half an hour,it will be OK.
B.Alright.What can we do for you?
A.Thanks for your kind and understanding.There is no need till now.We will do our best to make you a happy trip.
B.Thank you.