You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I amend you today?

USER: Please cancel my ticket because my brother came home suddenly, I would like to spend time with him.

ASSISTANT: Sure, we are to aid you.

USER: Thank you.

ASSISTANT: Let me know your name for checking your reservations.

USER: I am Scott Lee.

ASSISTANT: Thanks for your name. There is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for reaching us.