You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can i assist you?

USER: Jerry Thomas here. Reserve a flight ticket for me that is from JFK to AUS. I need a direct flight.

ASSISTANT: Ok, please mention your travelling dates?

USER: My travelling dates for journey are 10/15 to 10/17. My price limit is less than 500.

ASSISTANT: Sorry, I did not find any flight ticket as per your requirement.

USER: Ok, not a problem. Thank you.

ASSISTANT: Most welcome.