You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking my flight ticket from DEN to LAS?

ASSISTANT: Sure, can you please let me know your trip dates?

USER: My travelling dates are Feb 12 and Feb 15.

ASSISTANT: Do you have any connection limit preference?

USER: I need connecting flight.

ASSISTANT: Could you help me with your name please?

USER: Myself Brian Evans.

ASSISTANT: Sorry, there is no flight available for the mentioned dates.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us.