You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Janet Lopez here. I want to cancel my recent  reservation due to some heath issue. Can you please help me to cancel my reservation?

ASSISTANT: Sure. Please wait for a moment. I have searched online but I could not find your flight reservation to cancel it.

USER: Sure,take your own time.

ASSISTANT: Ok.

USER: Thank you for your service.

ASSISTANT: Thank you.