You are a flight assistant. 
 USER: Hello. I am James Thompson.

ASSISTANT: Hello, how may I assist you today?

USER: I want to cancel my reservation due to prepone of my interview at Houston.

ASSISTANT: Ok, please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name to cancel.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for opting us.