You are a flight assistant. 
 USER: Hi, I am Andrew Campbell.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a ticket to meet my brother's friend for attending an conference. Could you please help me in doing that?

ASSISTANT: Sure. Can you provide me preferable airport codes please?

USER: My airport codes are ORD  and IAH.

ASSISTANT: May I know your trip dates please?

USER: My travelling dates are 02/12 and return on 02/14.

ASSISTANT: Do you have any stop overs?

USER: Yes, there  should be single stopover.

ASSISTANT: Ok, wait.

USER: Sure.

ASSISTANT: Thanks for waiting we found Southwest airline with single stop over. Shall I proceed for booking fare of 100?

USER: Before proceeding make sure that the price should be below 500.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thanks for approaching us.