You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Miller.

ASSISTANT: How can I guide you now?

USER: I want to change my existing reservation, due to heavy rainfall in New York, can you help me?

ASSISTANT: Christine Miller, please allow me to check with availability of your previous booking.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there is no active reservation found under your name.

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

ASSISTANT: Sorry for the inconvenience. Have a great day.