You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My business meeting has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Yes, I can help you. May I know your name?

USER: I'm Samuel Robinson.

ASSISTANT: No reservation found for you, Samuel.

USER: Ok, no issue.I will choose another flight. Thank you for your information.

ASSISTANT: Thank you for approaching us.