You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

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

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

USER: Sure, my name is Gregory Young.

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

USER: That's ok, thank you.

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