You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, may I know your name please?

USER: Edward Hill.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.