编段对话！在线等！

要求写两段对话，每段要求三分钟左右。
题目如下：You and your friend are going to FuZhou(福州）,you want to take an express(快车）and to have two lower both tickets,but it only pairs the upper and lower together to sell,and you may ask the conductor on the train to change the tickets for you .Then you get two seats NO.20 and NO.21 in car 5. In the end, you ask about the time leaving and arriving.写的好的追加分！
演员只要求两个人：一个人演买票的，另一个人演卖票的。
情景一是：在火车站售票窗口发生的对话。
情景二是：在火车上要求换票的时候发生的对话。

英文版本的？
Me:Excuse me!
Ticket conductor:Yes? May I help you?
Me:Sorry, I just want to know can I change the ticket?
TC:What's the problem?
Me:I am going to FuZhou with my friend and I want two lower tickets, but there is only pairs the upper and lower together to sell, and I just want to know can I change the upper ticket to lower ticket?
TC:Well, I think you can ask the conductor on the train to change your ticket, I can't change it for you.
Me:Ok, Thank you.
TC:You are welcome.

Me:Excuse me!
TC:Yes? What can I do for you?
Me:Sorry, I just want to ask you if I can change my ticket?
TC:Is the ticket something wrong?
Me:Oh, no. Because I want two lower tickets, but it's one upper ticket and one lower ticket, and I want to sit with my friend.
TC:Ok, I see, it's not a big deal. I can change it for you. Just wait a minute.
Me:Thank you so much.
TC:You are welcome.
(Awhile later)