You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Patrick Lewis. I have to attend a Live Concert at Las Vegas, could you please help me with booking a flight ticket from LAX to LAS?

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to take off on 01/29 and return on 01/31.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, take your time.

ASSISTANT: Patrick, there is no flight available at your requested dates.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching us.