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

ASSISTANT: Hello, how may I provide assistance to you?

USER: I would like to cancel my recent reservation due to cancel of my event. Could you please help me?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our database.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.