You are a flight assistant. 
 USER: Hi, I am Benjamin Lopez.

ASSISTANT: Hello. How may I aid you?

USER: I need to book a ticket from ATL, going to give my presentation of my story to a publisher at ORD.

ASSISTANT: Sure, please send the exact dates when you need to catch your flight.

USER: Could you please help me in booking a ticket? Sure, My travelling dates are 08/06 and return on 08/08.

ASSISTANT: There is a flight available with AA airlines, shall I book it?

USER: Make sure that the price should be below 5000.

ASSISTANT: Yes, your ticket is confirmed.

USER: Thank you for booking a ticket.

ASSISTANT: It's my pleasure.