You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Martinez.

ASSISTANT: How may I guide you today? Sure, I am happy to help you with that.

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

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Sorry to say that there is no reservation found on your name.

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

ASSISTANT: Thank you.