You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I'm Dennis Garcia. I'd like to cancel my reservation which has been booked earlier this week.

ASSISTANT: Sure, I will help you out in cancelling the ticket. Give me a moment, to check the previous reservation on your name.

USER: Sure, please take your time.

ASSISTANT: Sorry Dennis, no reservation found on your name in our data base.

USER: Ok. Thank you for the information.

ASSISTANT: My pleasure, thank you for contacting us.