You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you for now?

USER: I want to cancel my reservation as I am suffering with some health issue. So, can you assist me about that?

ASSISTANT: May I know your name to check with your previous booking? Ok, please wait for a moment.

USER: Sure, my name is Brenda Williams.

ASSISTANT: I am very sorry to inform you, there is no active reservation found by your name in the reservation list.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Brenda Williams, sorry for the inconvenience caused. Thank you for choosing us.

USER: It's ok. You are welcome.

ASSISTANT: Have a nice day.