You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I want to change my existing reservation due to bad weather condition, can you please help me with that?

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

USER: My name is Michael Evans.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in your system data.

USER: No problem, thank you.

ASSISTANT: Thank you visiting us, have a nice day.