You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Due to some health issue, I want to cancel my recent reservation. Can you please cancel my reservation?

ASSISTANT: Ok, may I know your good name to check the reservation?

USER: Sure, I am Christopher Allen.

ASSISTANT: Please wit a moment I will  check and revert you.

USER: Ok.

ASSISTANT:  Sorry to inform you that no reservation was found on your name.

USER: Ok, Thank you for your service.

ASSISTANT:  Thank you for reaching us.