You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a ticket from AUS to DCA. Could you book a ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Travelling dates are from Sept, 12 to Sept, 14.

ASSISTANT: On which name shall I reserve flight ticket?

USER: My name is George Davis.

ASSISTANT: Do you need any specifications?

USER: I would like to depart in the morning.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Thank you.

ASSISTANT: Thank you for reaching our service.