You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Christopher Harris here, I want to cancel my reservation as I am unwell. Can you please do that for me?

ASSISTANT: Sure, I will help you in cancellation.

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for reaching us.