You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you now?

USER: I am Margaret Martinez.

ASSISTANT: Thanks for providing your name.

USER: Due to weather problems I need to change my existing reservation, Can you help me for change reservation please?

ASSISTANT: Sure, I am here to help you. Please wait a moment.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: Thanks for connecting with us.

USER: Thanks for your valuable information.

ASSISTANT: Have a great day.