You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I can help you with that. May I know your name?

USER: Sarah Walker.

ASSISTANT: Please hold on. I will get back to you.

USER: Sure.

ASSISTANT: Thanks for your patience. There was no reservation found on your name.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for approaching us. Have a nice day.