You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to cancel my recent reservation because my health condition was not good?

ASSISTANT: Sure, may I know your name?

USER: I am Katherine Hall.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.