You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Can I have journey dates?

USER: I need to book a flight ticket to Las Vegas, NV - LAS from Denver, CO - DEN. Arrival date is 01/10 and departure date is 01/08.

ASSISTANT: And the price limit?

USER: Price limit is 5000.

ASSISTANT: I am sorry to inform you that there is no flight available with the provided details.

USER: OK, no issues. Thank you.

ASSISTANT: Have a great day!.