You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Margaret Hall. Owing to an emergency, I want to cancel my reservation.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: We are sorry to inform you that there is no reservation found with your provided name.

USER: Not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you.