You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Could you help me out to change my reservation?

ASSISTANT: OK. Can I know your name?

USER: Sure, this is Larry Clark.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Oh! that's fine. Anyway, thank you for your support and quick service.

ASSISTANT: Thank you for reaching us.