You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Sandra Green. I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, I can do that for you. Please wait, I will check your reservation status and let you know.

USER: Sure.

ASSISTANT: Green, I did not find any reservation under your name in our database.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome and thank you for choosing us.