You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Brenda Hill, because of my health issues I do want to cancel my reservation.Can you assist me to cancel my existing reservation?

ASSISTANT: May I know your name for better search of your reservation?

USER: I am Brenda Hill.

ASSISTANT: Sorry, Hill no reservation found on your name.

USER: It's ok it might be cancelled by my mother but she have not informed me yet.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.Have a great day.