You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I need to change my existing reservation, can you please help me?

ASSISTANT: Surely, I will help you out.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Myself Paul Clark.

ASSISTANT: Thanks for your name, please wait.

USER: Ok, I will be waiting.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: That's ok, thank you for searching my details.

ASSISTANT: Thank you for availing us.