You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Mark Miller. I am planning to visit Fun Fair exhibition in Las Vegas NV-LAS with my team members.So I would like to book a flight ticket. Could you please help me in booking a flight ticket?

ASSISTANT: Sure, could you please provide your journey dates?

USER: My journey dates are 03/17 and 03/19.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Kindly mention your budget for airfare?

USER: My budget is 200.

ASSISTANT: May I know your source point?

USER: My source point is Denver CO-DEN.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, no flights found on that day.

USER: Ok, no problem,. Thank you for your help.

ASSISTANT: Thank you for approaching us.