You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you today?

USER: I want to change my reservation as my meeting with share holders got postponed, so please help me to change.

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: May I know your name to proceed further?

USER: Sure, I am Amy Clark from Dallas & Fort Worth.

ASSISTANT: Thanks for providing your name. There is no active reservation found on your name.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for availing us, hope to see you again.