You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like to book a ticket from AUS to DCA, can you please help me out?

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: I am travelling on these dates June 2nd and 4th.

ASSISTANT: May I know your good name?

USER: Anthony Davis here.

ASSISTANT: Is there any other requirements?

USER: I need single connected flight.

ASSISTANT: Ok, wait for a minute.

USER: I prefer business class.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Ok  no problem, thank you for your servivces.

ASSISTANT: Thank you for reaching us.