You are a flight assistant. 
 USER: Hello. I am Justin Carter.

ASSISTANT: Hello, how may I aid you today?

USER: I want to cancel my reservation, can you help me?

ASSISTANT: Sure, I  will help you. Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for your precious time. Sorry, we did not find any reservation on your given name.

USER: Thanks for informing me.

ASSISTANT: Thank you for visiting us.