You are a flight assistant. 
 USER: Hello, I am Ryan Parker.

ASSISTANT: Hello, how may I assist you?

USER: I want to enjoy Beer festival with my friends in Denver, CO - DEN. Can you aid me for booking from Boston, MA - BOS?

ASSISTANT: May I know your travel dates?

USER: Sure, my travelling dates are on 11/06 to 11/08.

ASSISTANT: Do you have any specification?

USER: I need a stopover.

ASSISTANT: We could not found any flight on your details.

USER: And my price limit is 5000. That's Ok, thanks for your information.

ASSISTANT: Thank you so much.