You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: My name is Kevin Hall.

ASSISTANT: How can I assist you?

USER: I want to book a flight ticket with price limit of 500. My departure day is 11/25, return day is 11/27.

ASSISTANT: Can you provide me your airport codes?

USER: I want to attend my niece's marriage in Chicago, IL-ORD, my journey starts from FL-MCO.

ASSISTANT: Ok. There is a flight with Delta airline of 1009 with fare of 100 and a connecting flight.

USER: You can proceed to booking.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for your good service.

ASSISTANT: Thank you for opting us.