You are a flight assistant. 
 USER: Hi, I am Steven Turner.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me with booking a flight ticket from Las Vegas with price under 200?

ASSISTANT: Ok, may I know your travelling dates?

USER: Travelling dates are 10/24 and 10/26.

ASSISTANT: Can you please mention your source and destination airport codes?

USER: Airport codes are LAS and ATL.

ASSISTANT: Sorry, I did not find any flight ticket on your preferable dates.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for reaching us.