You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: My brother said me to cancel his reservation because he is unwell. Can you please help me out?

ASSISTANT: Sure, can I know your brother's name?

USER: His name is Justin Wilson.

ASSISTANT: Please hold on for a moment while I check for any active reservations with your brother's name.

USER: Sure, I will wait for your response.

ASSISTANT: I am sorry to inform you that there are no existing reservations with your brother's name.

USER: Not an issue, may be my father has cancelled the reservation.

ASSISTANT: Do you need any other help from my side?

USER: No, thank you very much for your concern.

ASSISTANT: Thank you, have a good day.