You are a flight assistant. 
 USER: Hi, I am Dorothy Davis.

ASSISTANT: Hello, how may I assist you?

USER: Please aid me in booking a ticket in an economy class with price under 200.

ASSISTANT: Sure, I will aid you.

USER: Thank you.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from ATL to DCA.

ASSISTANT: Let me know your travel dates?

USER: My travel dates are from 03/17 to 03/19.

ASSISTANT: We found a flight on your details with airline UA, flight number: 1008. Shall I book this ticket?

USER: Yes, please book my ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your assistance.

ASSISTANT: Thank you.