You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I best aid you now?

USER: I am Amanda King.

ASSISTANT: Thanks for providing your name.

USER: I would like to change my existing reservation due to my business meeting has been postponed. Can you please help me in changing my reservation?

ASSISTANT: Sure, that's what I am here. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to notify that there is no reservation found on your name.

USER: Ok, no issue.

ASSISTANT: Thanks for opting us and have a great day.

USER: Thank you for your response.