You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am suffering from some health issues, so I need to cancel my ticket. Can you help me?

ASSISTANT: Sure, help me by providing your name so that I will help you easily.

USER: My name is Brandon Martinez.

ASSISTANT: Thanks for your name, there is no reservation found under your name Brandon Martinez.

USER: Oh! I think it might be cancelled by my  sister. Anyway;s thank you.

ASSISTANT: Ok, thanks for choosing us.