You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you help me in changing my recent reservation?

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

USER: Paul Young here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Paul Young, there is no active reservation found under your name to do modifications in that.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.