You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Due to heavy snowfall, I can't travel to New York. Can you help me in changing my existing reservation?

ASSISTANT: Sure, I will help you with this. Can you please provide your name to check the reservation status?

USER: My name is Helen Wilson.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Helen Wilson, there is no active reservation found with your name in our database to change it.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for contacting us.