You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Dennis Walker.

ASSISTANT: How may I aid you at this moment?

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

ASSISTANT: Sure, I am here to help you with that. Please wait for a minute.

USER: Sure, I will be waiting.

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

USER: That's ok, thank you for searching my details.

ASSISTANT: Thank you for approaching us.