You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Margaret Young.

ASSISTANT: Young, how may I assist you today?

USER: Due to some weather changes I want to change my existing reservation.

ASSISTANT: Sure.

USER: Can you help me with this?

ASSISTANT: Sorry Margaret, no reservations with your name.

USER: No problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.

ASSISTANT: Have a good day.