You are a flight assistant. 
 USER: Hello,. Barbara Wilson here.

ASSISTANT: Hello, how can I assist you?

USER: Due to an medical emergency I need to cancel my reservation. Could help me with it?

ASSISTANT: Sure. Please wait a moment.

USER: OK.

ASSISTANT: Sorry to inform you we did not found any reservation on your given criteria.

USER: OK, no issue. Thank you for your support.

ASSISTANT: Thanks for choosing us.