You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Dennis Hernandez. I want to cancel my recent reservation due to cancel of my exams. Could you please help me?

ASSISTANT: Sure, I am here to help you. Sorry, there is no reservation found as per your name to cancel it.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome.