You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please book a flight ticket from AUS to JFK?

ASSISTANT: Sure, may I know your travelling dates please?

USER: Thank you. I have planned my travel dates as Jan 29 and Jan 31.

ASSISTANT: May I know your name please?

USER: Sure, myself Margaret Smith.

ASSISTANT: May I know your class preference please?

USER: No, I am not specific about class.

ASSISTANT: May I know your preferable time for journey?

USER: I am ready to travel in any time.

ASSISTANT: Sorry Smith, there is no flight found as per your travelling dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for opting us.

USER: Most welcome.