You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, please let me know your good name?

USER: I am Nancy Davis.

ASSISTANT: That's a nice name Nancy Davis, what help do you require from us?

USER: I am very happy to change my existing reservation because my examination was postponed, now I have much time to prepare for the exam. So please help me in modifying my recent reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a minute, I will get back to you.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no reservation found with your name Nancy Davis.

USER: It's not a problem. Thanks for checking.

ASSISTANT: You are most welcome. Thank you for connecting with us.  Hope you will prepare will for the exams.