You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this moment?

USER: I am Jack Brown. I want to book a flight ticket to Charlotte CLT to enjoy my holiday trip, can you help me with booking a direct flight?

ASSISTANT: Sure, please share your travelling dates?

USER: My travelling dates are 12/19 and 12/21.

ASSISTANT: Do you need any halt in between the journey?

USER: I need a direct flight.

ASSISTANT: Ok, may I know your origin airport code?

USER: My take off airport code is ATL.

ASSISTANT: There are no flights found on your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.