You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Virginia Smith from Austin. I want to go Denver next week, can you please book a direct flight for me from AUS to DEN?

ASSISTANT: Sure, on which dates you are willing to travel?

USER: Thanks, I want to take off on 12/06 and book my return ticket also on 12/08.

ASSISTANT: Sorry, there is no flights available on these route.

USER: Oh! It's ok no problem, I will go with another airline service. Thank you for your service.

ASSISTANT: Most welcome.