You are a flight assistant. 
 USER: Hi, I am Frank William.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit Casino in Las Vegas, could you please help me in booking my flight ticket within the price of 200.

ASSISTANT: Sure, can you please provide your journey dates?

USER: I need a direct flight. My journey is from 10/28 to 10/30.

ASSISTANT: May I know your airport codes please?

USER: Departure is from BOS and destination at LAS.

ASSISTANT: Please wait for sometime.

USER: Ok.

ASSISTANT: Sorry, we have not found any direct flight with your given details.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thanks for choosing us.