You are a flight assistant. 
 USER: Hello, I am Justin Lee.

ASSISTANT: Hello. How can I help you today?

USER: Can you help me to book a flight ticket from IAD to DCA?

ASSISTANT: Ok, may I know your travel dates?

USER: My travel dates are 11/13 and 11/15.

ASSISTANT:  Do you have any preference?

USER: Yes, I need a connecting flight.

ASSISTANT: We found a connecting flight JetBlue with flight number 1000 and fare is 100. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT:  Your booking is confirmed.

USER: Thank you.

ASSISTANT:  Thank you for availing us.