You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to visit Seattle with my friends on 04/04.Can you please help me for booking the flight tickets?

ASSISTANT: Sure, I will help you to book a flight ticket.

USER: Thank you.

ASSISTANT: May I know the exact airport code of Seattle and from where you want to travel?

USER: The exact airport code of Seattle is WA-SEA and I want to start my journey from Washington, DC-DCA.

ASSISTANT: Is this a round trip? Will need a return ticket, too?

USER: No, it is not a round trip.I want the return ticket on 04/06.

ASSISTANT: Ok fine. May I know your name to proceed further?

USER: Sure, my name is Jennifer Lewis.

ASSISTANT: Sorry, I cannot find any flight with your travel dates, do you have any other plan dates?

USER: No, I did not planned yet.

ASSISTANT: That's fine.

USER: Thank you for your information.

ASSISTANT: It's my pleasure, have a great day.