You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me in booking a flight ticket from DCA to reach SFO?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My journey dates are from Oct 01 to Oct 03.

ASSISTANT: Ok, could I have your name please?

USER: My name is Michael Young.

ASSISTANT: Ok, do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: Sorry, there is no flight with your request.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: You are welcome, have a great day.