You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I want to cancel my brother's reservation because he is not well. Can you please help me in cancelling his reservation?

ASSISTANT: Sure, I am happy to help you. Can you please let me know your name?

USER: His name is Donald Miller.

ASSISTANT: Ok, please give me a minute.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, I didn't find any reservation on your name in our database.

USER: No problem, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us.