You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I assist you?

USER: Please cancel my recent reservation owing to an emergency.

ASSISTANT: Sure, I am happy to help you. Let me check your reservation status first.

USER: Ok.

ASSISTANT: For checking, may I know your name?

USER: My name is David Wilson.

ASSISTANT: Sorry, I have not found any reservation on your name in our database.

USER: Thanks.

ASSISTANT: David, thank you for contacting us.