You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to travel from IAD to AUS. Can you please help me in ticket booking?

ASSISTANT: May I know your trip dates to go?

USER: My travel dates are from Aug 19 to Aug 21.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I am fine with any time.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want a normal cost airline and also I am looking for a single connecting flight.

ASSISTANT: May I know your good name?

USER: Myself Alexander Nelson.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: It's ok, thank you for searching.

ASSISTANT: Welcome Alexander Nelson.