You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My business trip  dates are postponed, so I need to modify my travel dates, can you please change my ticket?

ASSISTANT: Sure, I can help you over that.

USER: Thank you.

ASSISTANT: May I know your name for checking your status of reservation to change it?

USER: My name is Dennis Collins.

ASSISTANT: Thanks for your name, there is no reservation found on your name Dennis Collins.

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

ASSISTANT: Ok, thanks for approaching us.