You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My friend invited me to attend kite festival at Boston, can you please book a ticket from Washington?

ASSISTANT: Sure, let me know your travel dates please?

USER: Sure, I would like to depart from my location on 8th Dec and I want to return back by 10th Dec.

ASSISTANT: Could you please share me your airport codes?

USER: Sure, my source airport code is IAD and I want to land at BOS.

ASSISTANT: May I know your connection limit?

USER: I need direct flight only.

ASSISTANT: Do you need any other preference?

USER: No, I don't have any other specifications.

ASSISTANT: Can I know your name please?

USER: Myself David Moore.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for contacting us.