You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you today?

USER: My name is Betty Harris. I want to book my flight ticket.

ASSISTANT: Can you please provide me journey details?

USER: My journey dates are from Dec/10 to Dec/12.

ASSISTANT: Could you please provide me your airport codes?

USER: My destination to NC - CLT, and my origin from CO - DEN.

ASSISTANT: Sorry to inform, there is no flight foun on your information. Thank you for choosing us.

USER: Thank you.