You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Justin Garcia. I want to book at ticket from Denver, CO - DEN to Las Vegas, NV - LAS.

ASSISTANT: OK, please provide me your journey dates?

USER: Sure, My travelling dates are from Feb 13 to Feb 15. Make sure that the price limit should not exceed 200 and with one connection.

ASSISTANT: OK, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to inform there is no flight available.

USER: OK. Thanks for your information.

ASSISTANT: Thank you, have a nice day.