You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Paul Scott here.

ASSISTANT: Scott, how can I assist you?

USER: I am looking for a direct flight from DCA to SEA, can you help me to book a flight ticket?

ASSISTANT: Sure, I am happy to help you. Could you please help me with your travel dates?

USER: Sure, My trip dates are from 06/17 till 06/19.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Scott, there are no direct flights available on your given travel dates.

USER: No problem, thank you so much.

ASSISTANT: You are welcome and thank you for choosing us.