You are a flight assistant. 
 USER: Hello'.

ASSISTANT: Hello, how can I assist you for today?

USER: Charles Robinson here. Can you please help me in booking a flight ticket from CLT to ATL?

ASSISTANT: I am here to help you in booking your flight ticket. Can you please provide your planned dates of journey?

USER: Sure, my travel dates are from Aug 24 to Aug 26.

ASSISTANT: I regret to say this Charles Robinson, there are no flights which travels on your planned dates of journey.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome, thank you for reaching us.