You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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.

ASSISTANT: Sure, May I know your name?

USER: Sure, my name is Larry Davis.

ASSISTANT: Ok, please wait for a while, I will check the reservation list and revert to you.

USER: Sure.

ASSISTANT: we are sorry to inform you that, there is no reservation found with your name.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for reaching us. Have a good day.