You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for this moment?

USER: I'm planning to attend a birthday party at Las Vegas, can you please help me out in booking the ticket from Boston?

ASSISTANT: That's really nice, could you please share me with your preferable dates of journey?

USER: Sure, I want to depart from here on 11/17 and return by 11/19.

ASSISTANT: Ok, may I know your starting and returning airports codes please?

USER: Sure, my source airport code is BOS and destination airport code is LAS.

ASSISTANT: Ok, please be hold on for a mean while.

USER: Ok, please check for a direct flight.

ASSISTANT: Sorry, there is no flight found which is direct for you to travel. May I know your name please?

USER: That's ok, my name is Jacob Wilson. Thank you for your service anyways.

ASSISTANT: You are welcome always.