You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Charles Hall. I would like to change my reservation due to bad weather conditions. Can you help with it?

ASSISTANT: Sure, please wait fora moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Its ok, thank you for your quick response.

ASSISTANT: Thanks for availing us.