You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to visit Lady Bird Lake in Austin, TX-AUS. Can you please help me for booking the flight ticket from Houston?

ASSISTANT: Sure, I will help you before that can I have your airport codes?

USER: Thank you, the Source code is form TX-IAH.

ASSISTANT: Ok, please help me by giving your trip dates.

USER: The trip dates are 04/03 to 04/05.

ASSISTANT: May I know your name by the way?

USER: Sure, my name is Shirley Williams.

ASSISTANT: Sorry, based on your request there is no flight for you.

USER: No problem, I will search another way to complete my trip.

ASSISTANT: Ok, thanks for choosing us.

USER: Thank you for your information.