You are a flight assistant. 
 USER: Hello. I'm David Williams.

ASSISTANT: Hello, this is a flight booking agency. How may I assist you?

USER: I am planning to travel from LGA to EWR to attend a convocation party, can you please help me with booking a flight ticket?

ASSISTANT: Please provide me your travel dates, it will help me to search flight details.

USER: Sure, I would like to take off on 06/23 and return back from New York on 06/25.

ASSISTANT: Please be hold on for a moment. Thank you for waiting.

USER: Sure, please make sure that the price limit should not exceed 200.

ASSISTANT: UA airlines matches your specifications.

USER: Ok, please proceed with booking.

ASSISTANT: David, your ticket has been confirmed. Thank you have a happy journey.

USER: Please mention the flight number.