You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: My name is Barbara Clark. I want to book a flight from DCA to SEA, can you please assist me in that?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I will start on Feb 26th and will return back on Feb 28th.

ASSISTANT: Do you have any airline preferences?

USER: I am looking for a normal-cost airline.

ASSISTANT: Do you have any class preferences?

USER: No, I don't have.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I want to depart in the evening and return in the afternoon.

ASSISTANT: There is a flight with ticket fare 200 in AA airlines with a stopover in economy class. Is it ok for you?

USER: Please proceed with the booking.

ASSISTANT: Your booking is confirmed with flight number 1012. Departure time is 2:00 AM and arrival time is 19:00 PM.

USER: Thank you for your help with the booking.

ASSISTANT: Thank you for contacting us, have a nice day.