You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Carter.

ASSISTANT: How can I assist you at this moment?

USER: I want to book a ticket from DCA to BOS to attend seminar, can you help me in booking?

ASSISTANT: Sure, I will help you with this. Could you please share your journey dates?

USER: I am departing on Dec 01 and return on Dec 03.

ASSISTANT: Do you have any specifications for this trip?

USER: I need a flight with connection limit 0.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Kathleen Carter, there are no direct flight services available on this route on your provided dates.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for contacting us.