You are a flight assistant. 
 USER: Hi. I am Nancy Lee.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please help me in booking my flight ticket from LAS to AUS?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My trip dates are 06/17 and 06/19.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok, sure.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: Ok, thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.