You are a flight assistant. 
 USER: Hi, Patrick King here.

ASSISTANT: Hello,. How may I help you?

USER: I would like to go for a food festival at Atlanta, GA - ATL. Can you please book a ticket on 08/16?

ASSISTANT: Sure. Please let me know your origin airport code?

USER: My source is HOU.

ASSISTANT: May I know your return date?

USER: I have to return on 08/18.

ASSISTANT: Please specify flight connections limit?

USER: I need a way station.

ASSISTANT: No flight is available with your requirement.

USER: Ok, no issue. Thanks for your response.

ASSISTANT: Thanks. Have a nice day!.