You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me to book a flight from OAK to DCA?

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

USER: My name is Joseph Allen.

ASSISTANT: Please help me with your planned travelling dates.

USER: My planned dates are 11/27 and 11/29.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a direct flight.

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

USER: I am fine with any class.

ASSISTANT: In order to help you better, please let me know if you have any other preferences in your journey.

USER: No. I did not have any requirements.

ASSISTANT: Thank you. Please allow me a minute.

USER: Sure.

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

USER: Proceed with booking.

ASSISTANT: I have booked your ticket in flight-1022. It departs at 4 AM and arrives at 0 AM.

USER: Thank you.

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