You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me in booking my flight ticket from AUS to JFK?

ASSISTANT: sure, could you please share your departure and arrival day?

USER: My planned travel dates are Dec 20-22.

ASSISTANT: Ok, could I have your name please?

USER: Myself, Donna Baker.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer to fly in connected flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: You are welcome, have a great day.