You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I made a reservation on the name of Brenda Williams and due to some health issues, I would like to cancel my reservation. Will you help me in cancellation?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, no existing reservation was found on your name in the database.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for opting us.