You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Linda Davis here. I want to cancel my ticket as I am sick.

ASSISTANT: Sure, I will help you with the cancellation of flight ticket reservation. Please wait for a moment.

USER: Ok.

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

USER: It's ok, thank you.

ASSISTANT: Thank you.