You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I would like to book a flight ticket.

ASSISTANT: Sure, can you provide me your travelling details?

USER: I need to fly from Washington DC-DCA to Dallas & Fort Worth, TX-DFW.

ASSISTANT: OK, let me know your travelling dates?

USER: Sure, Travelling dates are from Sep 09 to Sep 11.

ASSISTANT: Could you please help me out with your name?

USER: I am Stephanie Carter.

ASSISTANT: Do you have any other requirements?

USER: Yes, I want a flight with 1 connection limit and prefer to have price with in 500.

ASSISTANT: OK, please wait a while I will get back to you.

USER: OK,.

ASSISTANT: Thanks for being patient, unfortunately there is no flights matching your specifications.

USER: OK, Thank you for your service.

ASSISTANT: Thanks for reaching us, have a nice day.