You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: My interview got postponed, Can you please change my existing reservation?

ASSISTANT: Sure, I am happy to help you to change the ticket details once I have found your ticket. Can I know your name please?

USER: My name is James Smith.

ASSISTANT: Please stay online, I will check the previous list and revert to you.

USER: Ok.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Ok, Thank you.

ASSISTANT: Thanks for approaching us.