You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you aid me in booking a flight ticket from AUS to DCA?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: Sure, I would like to go on July 16th and return back on July 18th.

ASSISTANT: Ok, please mention your name.

USER: Myself Gregory Thomas.

ASSISTANT: Ok, do you have any connection limit?

USER: Make sure it is a single connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: Ensure the return flight should be in the afternoon.

ASSISTANT: Sorry, no flights are available on your route with your time limit.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.