You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Moore here.

ASSISTANT: How may I serve you?

USER: I would like to cancel my recent reservation, can you help me with this?

ASSISTANT: Yes, please I will help you with flight ticket cancellation. Wait for a moment please.

USER: Thank you. Sure, take your own time.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you.