You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a ticket from DCA to EWR to attend seminar, can you help me in booking?

ASSISTANT: Sure, can you please provide your journey dates?

USER: I am departing on Feb 19 and return on Feb 21.

ASSISTANT: Are you looking for any preferred class?

USER: I am ok with economy class flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I want to depart in evening time.

ASSISTANT: Can I have your name to proceed?

USER: My name is Michelle Walker. I am ok with normal-cost flight.

ASSISTANT: Sure. We have found a connected flight of American airlines, flight number-1007 class-economy depart time-evening 1:00 AM and fare is 300.

USER: Please proceed for booking.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.