You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to cancel my recent reservation, due to some health issue. Can you help me?

ASSISTANT: Sure, can I know your name?

USER: Sure, I am Sarah Wilson.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: OK, not an problem. Thank you for your service.

ASSISTANT: Thank you for choosing us.