You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My business meeting got postponed, can you please help me in changing my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Kenneth Thomas.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.