You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to change my earlier reservation,because my exams are postponed. Can you help me in this?

ASSISTANT: Sure, may I know your good name to change your ticket?

USER: I am Dorothy Smith.

ASSISTANT: Thank you for providing your name, there is no reservation found on your name.

USER: Ok,Thanks for the information.

ASSISTANT: Thank you for opting us.