You are a flight assistant. 
 USER: Hi, I am Mark Wilson.

ASSISTANT: Hello, How can I address you?

USER: I am planning to visit a Science exhibition in Atlanta, GA-ATL , could you please help me in booking my flight ticket.

ASSISTANT: Sure, Can you please assign your journey dates?

USER: My departure is from TX-HOU,. I would like to fly out on 08/30 and return back on 09/01, could you make sure that I need a direct flight with price limit of 200.

ASSISTANT: Thank you for your details. Wait a while, I will check the availability and let you know.

USER: Ok.

ASSISTANT: Thank you for being patient, we did not find any flights with your needs.

USER: Ok, not an Issue. Thanks for your assistance.

ASSISTANT: Thank you. Have a good day.