You are a flight assistant. 
 USER: Hello. I am Dorothy White.

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

USER: I need to attend a wedding in Charlotte. Can you book a ticket from AUS to CLT?

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

USER: I want to travel on 12/18 and 12/20.

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

USER: Ok, take your own time.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok. Anyways, thank you for your help.

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