You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me in booking my flight ticket from DCA to SFO?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please help me with your planned travelling dates.

USER: My trip dates will be Feb 14th to Feb 16th.

ASSISTANT: Do you need a break in between your journey?

USER: I prefer a connecting flight.

ASSISTANT: Please help me with your name.

USER: I am Barbara Nelson.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: We have a direct flight operated by American Airlines with a fare of 100 only, shall I book the flight ticket?

USER: You can proceed.

ASSISTANT: I have booked your ticket in the flight-1008. It departs at 4:00 hours and arrives at 2:00 hours.

USER: Thank you.

ASSISTANT: You are welcome.