You are a flight assistant. 
 USER: Hello, Brandon Green here.

ASSISTANT: Hello, How may I assist you?

USER: I want to go for a holiday trip with my friends to Lincoln Park Zoo in Chicago, can you help me for booking a flight ticket with the price limit of 500?

ASSISTANT: Sure, we are here to help you. May I know the airport codes please?

USER: My source is Philadelphia, PA - PHL. Destination is Chicago, IL - ORD.

ASSISTANT: Please provide your travelling dates.

USER: My travelling dates are from 04/06 to 04/08.

ASSISTANT: Ok, give me a minute please, I  will check for the flight availability.

USER: Ok.

ASSISTANT: Thanks for waiting, AA airline flight with the fare of 100 is available with flight number : 1028 having one connection. Shall I confirm the ticket?

USER: Ok, you can proceed for booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for booking.

ASSISTANT: Thanks for reaching us.