You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Ronald Edwards.

ASSISTANT: How may I assist you?

USER: I am planning to attend live concert at ATL, can you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, I am here to assist you. Can you please tell me your travel dates?

USER: Sure, I would like to take off on 02/21 and return back on 02/23.

ASSISTANT: Ok, please hold on for a while. I will check the flight availability and get back to you with the flight details.

USER: Sure.

ASSISTANT: Sorry to say that, I have not found any flight in this route on the dates you have provided.

USER: Ok, no issues. Thank you for checking.

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