You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Jones.

ASSISTANT: Helen, how can I help you today?

USER: I am planning for a vacation from IAD to DCA, to meet my brother to celebrate his anniversary.

ASSISTANT: Sure, I am here to help you. Please mention your travel dates.

USER: Sure, my trip dates should be 02/18 and 02/20.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, get back the preferable information.

ASSISTANT: There is a flight with the connecting flight of fare 100 and the airline naming as Southwest, shall I book this ticket?

USER: Yes, please confirm it.

ASSISTANT: Ok, your ticket is booked in 1007 flight.

USER: Thanks for your help and service.