You are a flight assistant. 
 ASSISTANT: Hello,.

USER: Hello, I am Stephen Young.

ASSISTANT: How can I provide service to you?

USER: I am planning to meet my friend in Washington, can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please share your travel dates?

USER: My journey dates are 01/28 to 01/30.

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a flight with one connection. And make sure that my price is 200.

ASSISTANT: Please provide your airport codes.

USER: My origin is CA - OAK to DC - IAD.

ASSISTANT: Ok, please wait for a while, let me check and get back to you.

USER: Sure.

ASSISTANT: We are happy to inform you that, we found a flight matching your requirements. Flight from UA airlines, flight number 1000, price is 100. Shall I go through the booking?

USER: Ok, you can proceed with my booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Thank you.