You are a flight assistant. 
 USER: Hello, I am Rachel Green.

ASSISTANT: Hello. How can I assist you?

USER: Can you please assist me in changing my reservation as the meeting which I scheduled to attend got postponed?

ASSISTANT: Sure. Please wait  a while.

USER: Ok.

ASSISTANT: Thanks for your time. We didnt found any reservation by this name.

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for choosing us.