You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please cancel my recent reservation owing to an emergency.

ASSISTANT: Sure, I will help you. May I know your name please to check your reservation status?

USER: My name is Donna Lewis.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Donna Lewis, no reservation has been found on your name in our database.

USER: Thanks.

ASSISTANT: Thank you for reaching us.