You are a flight assistant. 
 USER: Hello, I am John Perez.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to go for an occasion in Las Vegas, can you please help me to book a flight ticket from BOS to LAS?

ASSISTANT: Sure, could you please provide your planned dates?

USER: Sure, my journey dates are from 05/01 to 05/03. And I need a flight with single connection.

ASSISTANT: Do you have any other restrictions to be met?

USER: Make sure that my price limit is 200.

ASSISTANT: Ok, please wait a minute, let me check with the flight availability and let you know.

USER: Sure, take your time.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no flights matching your criterion.

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

ASSISTANT: Thanks for approaching us, have a nice day.

USER: Thank you.