You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Due to bad weather conditions, I want to change my existing reservation. Can you help me out?

ASSISTANT: May I know your name, please?

USER: Sure, my name is Susan Davis.

ASSISTANT: Please give me a minute, I will find your existing reservation.

USER: Ok.

ASSISTANT: sorry, there is no reservation found under your name.

USER: That's fine, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.