You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Samuel Anderson. My business meeting has been postponed.So, I would like change my existing reservation.

ASSISTANT: Sure.

USER: Can you please help me with that?

ASSISTANT: There is no reservation on your name. Thanks for reaching us.

USER: Ok, no problem. Thank you for your help.