You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Actually, my interview has been postponed which was at Denver so I need to cancel my recently done reservation, can you please help me in this intent?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I have the name on which you reserved earlier?

USER: Sure, my reservation was on Karen Johnson.

ASSISTANT: Ok, please wait a moment and I will check reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Karen, no reservation found under your name to cancel.

USER: Ok, not an issue.

ASSISTANT: My pleasure.

USER: Anyways, thank you for your information.

ASSISTANT: Most welcome.