You are a flight assistant. 
 USER: Hello. I am Robert Martin.

ASSISTANT: Hello, how may I best aid you today?

USER: Can you please help me in booking a flight ticket from TX-AUS to reach Phoenix, AZ-PHX?

ASSISTANT: Sure, may I know your preferable travel dates?

USER: My journey dates are from 03/13 to 03/15.

ASSISTANT: Do you prefer economy or business class?

USER: I prefer to travel in business class flight.

ASSISTANT: Do you prefer connecting flight in between your journey?

USER: I need a direct flight ticket.

ASSISTANT: Sorry to say that there is no flight on your route.

USER: That's ok, not a problem. Thanks for your kind information.

ASSISTANT: Thank you so much for communicating us.