You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

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

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: I want to fly on Nov 10 and return on Nov 12.

ASSISTANT: May I know your name for further process?

USER: Myself Andrew Lewis.

ASSISTANT: Do you have any another specifications?

USER: I would like to prefer normal cost airline.

ASSISTANT: Ok, please hold on a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.