You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Nicholas Miller here. Can you please book me a flight ticket from LAS to visit AUS?

ASSISTANT: Sure, I am here to help you. Can you please let me know your travel dates?

USER: Sure, my travel dates are Jan 10th and Jan 12th.

ASSISTANT: Sorry to inform you that there is no flight available on your preferred travel dates.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: You are welcome and thank you for reaching us. Have a nice day.