You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I am Jack Williams.

ASSISTANT: I hope you are fine.

USER: I want to change my existing reservation, due to heavy rainfall in New York.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Jack, there is no reservation found on your name in our database.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us, have a nice day.