You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Frank Davis.

ASSISTANT: Frank, what kind of service you are expecting from us?

USER: I want to cancel my reservation, due to some health issue.

ASSISTANT: Let me check your reserved ticket status in our database. Please hold on.

USER: Ok.

ASSISTANT: Sorry, we could not find a reservation by your name.

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

ASSISTANT: Thank you for choosing us.

USER: Welcome.