You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you now?

USER: I have a reservation to attend a meeting. But it has been postponed due to some technical issues. Can you please change my existing reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Steven Miller.

ASSISTANT: Thanks for providing your name and please wait for a while.

USER: Sure. I will wait for your response.

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

USER: Ok, no issue. Thanks for your kind response.

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