You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a flight ticket from PHL to AUS. Could you help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from Apr 01 - 03.

ASSISTANT: On which name shall I reserve flight ticket?

USER: Nancy Hall.

ASSISTANT:  Do you need any specifications?

USER: I prefer direct flight.

ASSISTANT: Sorry, there are no flight tickets available with your journey dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching our service.