You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to cancel my recent reservation which is booked by my brother, can you please help me?

ASSISTANT: Yes, I can help you. Can I know your name for checking your reservation?

USER: My name is Matthew Lee.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.