You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Patrick Lewis. I am planning to celebrate my son birthday in the Mirage Hotel in Las Vegas, so please help me in booking a flight ticket.

ASSISTANT: Sure, I can be help you. Can you please share me your airport codes?

USER: My source from Boston MA - BOS and destination code is NV - LAS.

ASSISTANT: May I know your when you want to travel?

USER: I want to fly on 05/25 and return on 05/27.

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a halt in between my journey.

ASSISTANT: How much can you afford for flight ticket?

USER: I can afford up to 200.

ASSISTANT: Sorry to inform, there is no flight matches on your given details.

USER: Not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you.