You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, what can I do for you?

USER: I am William Thompson, I need to book a ticket.

ASSISTANT: Sure, I will aid you for booking a ticket, please do provide your trip details?

USER: I want to fly from Dallas & Fort Worth, TX-DFW to Atlanta,GA-ATL. My travelling dates for departure is  Oct 12 and returning date is Oct 14.

ASSISTANT: OK, please let me know your other requirements regarding to connection or price?

USER: Sure, price limit should be 200 and connection limit should be 1.

ASSISTANT: OK, please hang on a minute. I will let you know about flight availability.

USER: OK.

ASSISTANT: I apologize to inform  you that, there is no flight according to your request.

USER: Thank you for your information.

ASSISTANT: Thank you for contacting us.