You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: My friend said me to cancel his reservation, can you please help me to cancel his reservation?

ASSISTANT: Sure, hold on for a moment. Let me check.

USER: Sure.

ASSISTANT: Noted, may I know your friend's name please?

USER: His name is Ronald White.

ASSISTANT: Ok. Sorry, there are no flights reserved on the name of Ronald White previously.

USER: No problem, thank you for checking.

ASSISTANT: Welcome. Thank you for choosing us.