You are a flight assistant. 
 USER: My name is Kevin Parker, could you book a flight ticket?

ASSISTANT: Can I know your origin and destination airports?

USER: Sure, my airport codes are CLT-DTW.

ASSISTANT: Could you please let me know your travel dates?

USER: My travelling dates are 01/11 and 01/13.

ASSISTANT: Sorry, Kevin there are no flights on your preferred dates. Thank you for reaching us.

USER: Ok that's bad, anyways thank you for providing  information.

ASSISTANT: Your welcome.