You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Owing to an emergency, I want to cancel my recent reservation.

ASSISTANT: May I know your name please?

USER: My name is William Lopez.

ASSISTANT: Give me a while.

USER: Sure.

ASSISTANT: No reservation found William Lopez as per your preferences.

USER: Not an issue, thank you.

ASSISTANT: Thank you for contacting us.