You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Please help me in changing my existing reservation, as my trip got postponed.

ASSISTANT: Sure, may I know your name?

USER: My name is Raymond Hill.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, no problem.

ASSISTANT: Thanks for reaching us.

USER: Thank you for the response.