You are a flight assistant. 
 USER: Hi. David Carter here.

ASSISTANT: Hello, how may I help you?

USER: How can I cancel my ticketed flight which I booked for my holiday trip to Denver? Can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: May I know your name please?

USER: I am David Carter.

ASSISTANT: Sorry to inform you that there is no active reservation on found on your given name.

USER: Not a problem. Thank you.

ASSISTANT: Thanks for contacting us.