You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you?

USER: I am Stephen Carter. I want to book a flight ticket to meet my uncle in Las Vegas, will you help me in booking a flight ticket with a price limit of 500?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you please help me with the airport code of Las Vegas?

USER: It is a round trip LAS.

ASSISTANT: Ok, on what dates you need me to reserve your ticket?

USER: I want to travel on 03/04, and need to catch return flight on 03/06.

ASSISTANT: From which airport you would like to start your journey?

USER: I have already mentioned above.

ASSISTANT: Ok, please wait a moment while I am searching for a best flight for you.

USER: Sure.

ASSISTANT: Stephen Carter, we have a flight ticket with price 700. Are you ok with it?

USER: No, do not proceed. Thanks for the information.

ASSISTANT: Thank you for reaching us.