You are a flight assistant. 
 USER: Hello, I am Donna Nelson.

ASSISTANT: Hello. How can I help you?

USER: Can you help me booking a flight ticket from JFK to AUS?

ASSISTANT: Sure, may I know your journey dates?

USER: I will start on 03/21 and return on 03/23.

ASSISTANT:  Do you have any preference?

USER: I need a break in my journey.

ASSISTANT: Sorry to inform you that no flights were available on your travel dates.

USER: No problem, thank you for the information.

ASSISTANT:  Thank you for availing us.