You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to attend a Seminar in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: My name is Donald Collins.

ASSISTANT: Please help me with your departure and arrival airport codes to check for a flight.

USER: My airport codes are ORD and DCA.

ASSISTANT: Please let me know with your preferred journey dates.

USER: My travelling dates are Apr 21 and Apr 23.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a nonstop flight.

ASSISTANT: Please help me with your preferred class to fly.

USER: It's not an issue.

ASSISTANT: May I know if you have any other preferences in your journey, please?

USER: No.

ASSISTANT: We have a direct flight operated by Frontier Airlines with a fare of 100. Is it ok for you?

USER: Please proceed.

ASSISTANT: I have booked your ticket in flight-1006. It departs at 5 AM and arrives at 10 AM.

USER: Thanks for helping me.

ASSISTANT: Thank you for reaching us. Have a great time.