You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have to attend the music festival which is going to be held at Las Vegas, NV-LAS, could you help me with booking a flight ticket on 11/16?

ASSISTANT: Sure, may I know your source and return date?

USER: Sure, I will return back on 11/18 at Chicago, IL-ORD.

ASSISTANT: Ok, may I know your price limit?

USER: Sure, I can spend up to 200.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: Ok, I will search any other alternative. Thank you for your time.

ASSISTANT: Thank you for approaching us.