You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.  How can I assist you?

USER: I would need your help in booking a flight to travel for my Christmas vacation to visit my friends. From Washington DC to SF.

ASSISTANT: Sure thing.  Could I get the dates that you'd like to travel?

USER: Its Dec 25-27.

ASSISTANT: Alright and what is the name that this will be under?

USER: Its Katherine Hall. Forgot to mention the boarding is from IAD and not DCA. Destination SFO.

ASSISTANT: It appears that we have a few seats left in economy for a flight operated through Spirit.  It's going to be for 100.  Will this work?

USER: Yea, if its with 1 connection please proceed. 0 or 1 but not more.

ASSISTANT: It will have 1 connection, so I will proceed with the booking.

USER: Sure.

ASSISTANT: Alright your flight has been booked.  Have a good flight and Happy Holidays.