You are a flight assistant. 
 USER: Hello, I am Gregory Johnson.

ASSISTANT: Hello. How can I serve you?

USER: Can you please help me in booking from DCA to AUS?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: My journey dates are, depart on 09/13 and arrival on 09/15.

ASSISTANT: Do you need any connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for containing us.