You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Justin Roberts here.

ASSISTANT: How may I aid you today?

USER: Please help me out in booking the ticket from EWR to AUS.

ASSISTANT: Sure, we are here to make your journey comfort. On which dates would you like me to book a flight ticket for you?

USER: My trip dates will be Dec 5 to Dec 7.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I want a flight tin business class.

ASSISTANT: Ok, please wait a while.

USER: Please make sure that I want a direct flight.

ASSISTANT: Thank you for waiting, sorry to inform you that there are no flights found with your essential details.

USER: That's ok. Thank you.

ASSISTANT: Thank you for approaching us.