You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I will help you with this. May I know your name please?

USER: Sure, my name is Stephen Rodriguez.

ASSISTANT: Please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found as per your name to change any reservation.

USER: That's ok, thank you.

ASSISTANT: You are welcome.