You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can 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 with that?

ASSISTANT: Ok, may I know your name?

USER: My name is Donald Adams.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thank you.