You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, we are happy to help you. May I know your good name?

USER: I am Margaret Walker.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for contacting us.