You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you?

USER: Could you be my helping hand in booking me a direct flight?

ASSISTANT: Sure, please provide me your travel points?

USER: I will start my journey from Dallas, DFW to Washington, DCA to visit National Geographical park.

ASSISTANT: May I know your travel dates?

USER: 11/08- 11/10 are my willing dates to travel. Budget for my ticket is 200.

ASSISTANT: Sorry, no direct flights are available on your scheduled dates.

USER: Ok, i will choose other airline.

ASSISTANT: May I know your name?

USER: I am Paul Carter. Thank you for kind service.

ASSISTANT: Thank you, have a nice day.