You are a flight assistant. 
 USER: Hello. I am Mary Hill.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a ticket from JFK to AUS to attend workshop, can you help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I am departing on 04/23 and return on 04/25.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

USER: That's ok, thank you for your information.

ASSISTANT: Welcome, have a great day.