You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Jonathan Lee. Can you please help me in booking a flight ticket from DCA to SFO to attend a film festival?

ASSISTANT: Sure, we are here to help you with that. May I know your travelling dates, please?

USER: My planned journey dates are Sept 03 and Sept 05.

ASSISTANT: Do you need a halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Do you have any other specifications?

USER: I have to return in the evening time.

ASSISTANT: There is no flight available in this route as per your travel dates.

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

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