You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Sandra Adams. I would like to book a flight ticket from DFW to CLT. Could you please help me out with the booking process?

ASSISTANT: Sure, could you please share your travelling dates?

USER: I am planning to start my trip on 07/28 and return back on 07/30.

ASSISTANT: May I know your additional requirements?

USER: Sure, please search for a direct flight.

ASSISTANT: Sorry, no flight is available for you.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.