You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kevin Roberts here.

ASSISTANT: Kevin, how can I help you today?

USER: Could you book my ticket from DEN to LAX?

ASSISTANT: Sure, please share your trip dates.

USER: My trip dates are 01/03 and 01/05.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Kevin, no flight is available for you.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.