You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit Las Vegas, can you please book me a ticket from AUS to LAS?

ASSISTANT: Can you please tell me your travel dates?

USER: My preferable journey dates are from 10/21 to 10/23.

ASSISTANT: Please wait a moment. May I know your name?

USER: My name is Scott Wilson.

ASSISTANT: Sorry, no flights are available for you.

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

ASSISTANT: Ok, thank you for choosing us.

USER: Thank you for providing information.