You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to book a flight ticket from DEN to LAX?

ASSISTANT: Please provide your travelling dates?

USER: My travel dates are June 02 and June 04.

ASSISTANT: Is there any preference?

USER: I prefer connecting flight for this trip.

ASSISTANT: Can I know your name?

USER: I am James Martin.

ASSISTANT: Sorry, currently there is no flight for your travelling dates.

USER: No problem, thank you for the information.

ASSISTANT: Thanks.