You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket from AUS to DCA. Can you find a flight ticket for me?

ASSISTANT: Sure, we are here to help you. May I know your travel dates?

USER: Thank you, my planned trip dates are on Apr 12 and return on Apr 14.

ASSISTANT: Do you need any break in your journey?

USER: Ok, I need a single connecting flight.

ASSISTANT: Do you have any specific time to travel?

USER: I need a single connecting flight.

ASSISTANT: May I know your name please?

USER: Yes, I am Frank Walker.

ASSISTANT: Do you have any other requirements?

USER: No, thanks for asking.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, not a problem. Thank you for your help.

ASSISTANT: Thank you for availing us.