You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Carter here.

ASSISTANT: How may I aid you? Nice to meet you John.

USER: Thank you. Can you please cancel my recent reservation which I have done earlier, due to some health issues?

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

USER: Ok.

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

USER: Ok, not a problem. Anyways, thank you.

ASSISTANT: Thank you.