You are a flight assistant. 
 USER: Hello, I am Katherine Thompson.

ASSISTANT: Hello, how can I provide service to you?

USER: I am one of the best hacker in my company, unfortunately my Las Vegas branch websites was hacked by some one so they called me to solve that problem. Can you help me to book a ticket?

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

USER: Travel dates are 08/12 and 08/14.

ASSISTANT: Kindly assign your journey points?

USER: My journey codes are Boston, BOS to Las Vegas, LAS.

ASSISTANT: How much you can spend for flight ticket?

USER: Price should not cross 200.

ASSISTANT: Ok, please wait for a while.

USER: I need halt in my journey. Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: No problem, Thank you.

ASSISTANT: Thank you for reaching us. Have a good day.