You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Anna Martinez. Can you help me to book a flight with price 200?

ASSISTANT: Ok, I am here to help you. May I know your trip dates?

USER: My travelling dates are 09/16 and 09/18.

ASSISTANT: That's ok, let me know your airport codes.

USER: My source and destination airport codes are ATL and IAD.

ASSISTANT: Wait a moment.

USER: Ok.

ASSISTANT: According to your criteria, there is a flight-1018 with price 100.

USER: Proceed with booking.

ASSISTANT: Ok, booking is done with AA airline.

USER: Thank you.

ASSISTANT: Welcome, have a good day.