You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I need amend my reservation, can you help me out?

ASSISTANT: Yes, I can help you with that. Can I know your name for checking your previous reservation?

USER: Myself Nancy Allen.

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

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.