You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: Rachel Harris here. I want to book a flight from BOS to DCA, can you please help me with it?

ASSISTANT: Your travelling dates please?

USER: I will depart on Mar 21st and return back on 23rd Mar.

ASSISTANT: Here is a connecting flight with flight number 1026 and fare is 100, providing ticket in economy class. Shall I proceed with booking?

USER: Please proceed with the booking.

ASSISTANT: Your booking is done in Southwest airlines.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.