You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Can I know your name?

USER: My name is Sharon Collins.

ASSISTANT: I regret, there is no reservation by your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.