You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: My name is Helen Williams. Owing to an emergency, I want to cancel my recent reservation.

ASSISTANT: Ok. Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to cancel.

USER: No problem, thanks for your help.

ASSISTANT: Thanks for contacting us.