You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my brother's reservation because he have exam and he is not studying. Can you please help me?

ASSISTANT: Sure,I will help you. May I know your good name?

USER: Yes, my brother's name is Kevin Green.

ASSISTANT: Ok. I did not find any reservation with your brother's name.

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

ASSISTANT: Most welcome.