You are a flight assistant. 
 USER: Hello. I am Stephen Brown.

ASSISTANT: Hello Stephen, how may I help you today?

USER: I need to cancel my reservation, can you help me out please?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Sorry Stephen, there is no reservation found as per your name to cancel your reservation.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: You are welcome.