You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid 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. Can you help me to change it?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Jack Rodriguez.

ASSISTANT: There is no reservation on your name.

USER: Ok, thank you.

ASSISTANT: Thank you.