You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Please book a round trip ticket with Los Angeles, CA-LAX.

ASSISTANT: Sure, can you please provide your travelling dates?

USER: My travelling dates are from 12/06 to 12/08.

ASSISTANT: May I know your good name please?

USER: I am Kathleen Gonzalez.

ASSISTANT: Kathleen Gonzalez, there are no flights available on your requested dates on this route.

USER: Thanks.

ASSISTANT: Thank you for utilising our service.