You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Nicole Roberts, planning to visit Austin. Can you please book me the ticket in direct flight from Houston?

ASSISTANT: Sure, we are perky to help you. When would you like to make your journey?

USER: Thank you for your positive response. I am planning my journey on the dates of 09/11 to 09/13.

ASSISTANT: Can you please help me with providing your airport codes?

USER: My nearest airport codes of journey are from HOU to AUS.

ASSISTANT: Sorry, there are no flights are available matching your preferences.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for providing information.