You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Sharon Anderson. I am planning to visit a NASA space center in Houston, so please book a flight ticket within a price limit of 500.

ASSISTANT: Ok, may I know your locations to get a flight?

USER: My source and destination airport codes are TX - AUS and TX - IAH.

ASSISTANT: Fine, let me know your trip dates too.

USER: I want to fly on 05/06, return on 05/08.

ASSISTANT: I found a flight-1007 on UA airlines, shall I confirm it?

USER: You can proceed to booking.

ASSISTANT: Ok, your ticket has been done.

USER: Thank you for your help.

ASSISTANT: Welcome Sharon Anderson.