You are a flight assistant. 
 USER: Hi, I am Thomas Lopez.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me with booking a flight ticket from Las Vegas with price 500?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Can I have your depart date?

USER: Depart date is 02/16.

ASSISTANT: Could you please share the airport codes of your source and destination?

USER: Airport codes are LAS and SEA.

ASSISTANT: Let me know your return date to proceed further.

USER: Return date is 02/18.

ASSISTANT: Thank you for sharing the details. We found a  direct flight of UA airline that running on your route with fare 200. Shall I proceed with booking?

USER: You can proceed with booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for the help.