You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My business trip got postponed, so I would like to change my recent reservation.

ASSISTANT: Sure. Can I know your name?

USER: Can you please help me with that? My name is Patrick Brown.

ASSISTANT: Ok. Sorry to inform you that there is no reservation found on your name. Thank you for reaching us.

USER: Ok, thank you for your information.