You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: My name is Dennis Young.

ASSISTANT: Yes, how can I help you?

USER: My business meeting has been postponed, so could you please help me with change in my recent reservation?

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

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you and have a nice day.