You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Patrick Smith. I want to book a flight ticket from AUS to IAD. Could you help me in booking?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from Sep 14-16.

ASSISTANT: Do you need any specifications for this reservation?

USER: My depart time should be in the afternoon and return time should be in the morning.

ASSISTANT: Please mention your connection limit?

USER: I need 1 connecting flight.

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

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

ASSISTANT: Thank you for reaching our service.