You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please change my existing reservation as my trip got postponed?

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: Please share me your good name.

USER: My name is Christine Clark.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Never mind, thank you anyway.

ASSISTANT: Thank you for communicating with us.