You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. how could I assist you?

USER: I want to visit Old Houston Mormon fort state historic park with my friends in Houston to enjoy my holiday trip.

ASSISTANT: Sure,.

USER: Can I help me in booking my flight ticket?

ASSISTANT: Please provide me your airport codes?

USER: Source and destination is from AUS to IAH. Travelling dates are from 02/26 and returning on 02/28.

ASSISTANT: Do you have any other requirements?

USER: Yes, price limit is 500.

ASSISTANT: Please wait for a while, I will let you know the information.

USER: Sure.

ASSISTANT: Sorry to tell that there is no reservation found on your given details.

USER: Ok, no problem.

ASSISTANT: May I have your name please?

USER: I am Nicole Parker.

ASSISTANT: Thank you.

USER: Thanks for your help.