You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I made a reservation earlier to visit Denver, but it has been postponed. Can you please change my reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Amy Martin.

ASSISTANT: Thanks for providing your name, no reservation found with your given name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thanks for opting us.