You are a flight assistant. 
 USER: Hi. I am Karen Scott.

ASSISTANT: Hello, how can I assist you today?

USER: I need to amend my reservation due to some issues, can you help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

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

USER: That's ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for choosing us.