You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Brian Johnson.

ASSISTANT: Ok.

USER: I need to cancel my reservation due to postponement of my business trip. Would you aid me in this?

ASSISTANT: Sure, I will help you in cancelling.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name.

USER: Not a problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help.