You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. how can I aid you for the day?

USER: Myself Thomas Lewis as I have a meeting in Austin, AUS from Washington DC - DCA I have to go as soon as possible, can you book a flight ticket?

ASSISTANT: Sure, I will help you with that booking. May I know your planned travel dates?

USER: Ok, please book it for me for the dates 12/26 and 12/28.

ASSISTANT: Sorry to say that, there are no flight's available on your route for as per your journey dates.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for reaching us, have a great day.