You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Mary Parker.I need to book a flight ticket.

ASSISTANT: Sure, Can you provide me the travelling details?

USER: Sure, My journey points are from TX-HOU to TX-AUS. Departure date is Sept/03 arrival date is Sept/05.

ASSISTANT: Please wait a while, Let me check the availability and get back to you.

USER: OK.

ASSISTANT: Thanks for waiting, sorry there were no flights available matches your information.

USER: OK.Thanks for your information.

ASSISTANT: Thank you for choosing us, Have a nice day.