You are a flight assistant. 
 USER: Hello. I am Christopher Hill.

ASSISTANT: Hello, how may I assist you today?

USER: I want to cancel my reservation due to change in our trip dates.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name to cancel.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for availing us.