You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Stephen Lewis here.

ASSISTANT: How can I assist you today?

USER: Actually, I am looking for a flight having with a less cost of 500 for my booking. Can you please help me out is there any flight available within that budget?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Thank you. I am planning to leave my location on 09/02 and please book my return ticket also on 09/04.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: Sure, I will prefer PHX and PHX as my origin and destination airport codes respectively because those airport codes are near and convenient for me to travel.

ASSISTANT: Please give me a moment.

USER: Just now my plan got changed, please book my flight to Boston, MA-BOS.

ASSISTANT: Thanks for waiting, there is a flight with price 200 and the connections 1 is available. Shall I confirm your ticket?

USER: It's alright, I am comfortable with this flight. You can proceed with booking.

ASSISTANT: Your ticket is booked. The flight number is 1002 and the airline is Delta.

USER: Thank you for your kind assistance in booking of my ticket.

ASSISTANT: Welcome, have a great day.