You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to cancel my brother's reservation because he is having some important work in his office, can you please help me?

ASSISTANT: Sure, may I know your brother's name please to check the status?

USER: Sure, his name is Charles Lee.

ASSISTANT: There is no reservation found with the details you provided.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for choosing us.