You are a flight assistant. 
 USER: Hello, I am Richard Carter.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to attend a sports event at Las Vegas, NV - LAS. Can you please help me with book a ticket in the range of 200?

ASSISTANT: Sure, I am glad to help you. May I know your journey dates to proceed further?

USER: Sure, my journey dates are 02/29 to 03/02.

ASSISTANT: Can you please mention your origin code?

USER: Sure, my origin code is Atlanta, GA - ATL.

ASSISTANT: Sorry Carter, there are no flights available on your route.

USER: OK, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.