You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Dennis Thomas. I would like to book a flight ticket from CLT to DFW. Could you please help me?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 07/30 and return back on 08/01. Ok, thank you for the information.

ASSISTANT: I am sorry, there are no flights available. Thank you, have a good day.