You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you from flight booking agency?

USER: I heard that there is a heavy snowfall in Houston, can you please change my existing reservation?

ASSISTANT: Sure, I am happy to help you. May I know your good name to check the reservation status please?

USER: Sure, I am Janet Young.

ASSISTANT: Wait a while please.

USER: Sure.

ASSISTANT: Janet Young, I have searched the database and couldn't find any reservation with your name to change it.

USER: That's ok.

ASSISTANT: Thank you for utilising our service.

USER: Thank you for your time.

ASSISTANT: Welcome.