You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am a volunteer and participating in an awareness program in Las Vegas. Can you help me in booking a ticket?

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

USER: The journey dates are 12/01 and 12/03.

ASSISTANT: Could you please provide the airport codes?

USER: I would like to travel from BOS to LAS.

ASSISTANT: May I know your name to proceed further?

USER: My name is Stephen White.

ASSISTANT: Thank you for the details. Stephen, I am sorry to inform you that there is no flight available at your request.

USER: Its ok, thank you for the information.

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