You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to cancel my reservation due to sudden health issue. Can you please help me?

ASSISTANT: Sure, may I know your name?

USER: My name is Linda Green.

ASSISTANT: ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for choosing us.