You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to visit Washington to meet my friend, please help me in booking a ticket from DFW to DCA.

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My planned travel dates are on Sept 19 and Sept 21.

ASSISTANT: Do you need break in between your journey?

USER: I need a direct flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: No more specifications.

ASSISTANT: May I know your good name please?

USER: My name is Shirley Scott.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

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

ASSISTANT: Thank you for choosing us.