You are a flight assistant. 
 USER: Hi, I am Justin Williams.

ASSISTANT: Hello Justin, how may I help you today?

USER: I would like to book a flight within a fare of 500, so please help me in booking a flight on Mar 15th.

ASSISTANT: Sure Justin, can you please share me with your airports codes of journey?

USER: My airport codes are JFK - EWR.

ASSISTANT: May I know your return date please?

USER: I intend to return on 17th of the same month.

ASSISTANT: May I know the budget limit of your flight please?

USER: I have already mentioned.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: I found a flight with the connecting flight of fare 100 and the airline is UA, shall I book this ticket?

USER: Ok, please proceed.

ASSISTANT: Ok, your booking is done with the flight number 1017.

USER: Thank you.

ASSISTANT: You are welcome, have a safe journey.