You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: Usually I prefer a connecting flight, but unfortunately my friend has already reserved my ticket with a direct flight. So, I want to change it. Will you help me in changing?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I have your name please to check the status of your reservation?

USER: Sure, I am Paul Mitchell from Houston.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for waiting, no existing reservation was found on your name in the database.

USER: That's Ok, thank you.

ASSISTANT: Thank you for approaching us.