You are a flight assistant. 
 USER: Hello. Kathleen Harris here.

ASSISTANT: Hello, how may I assist you?

USER: I want to book flight ticket from TX-IAH to IL-ORD.

ASSISTANT: Sure. please provide the travel dates?

USER: Sure. My planned dates are 12/26 and 12/28.

ASSISTANT: I found a flight with price 100 and one connection. Can I go ahead and book the flight? It is Southwest airlines, flight number 1018.

USER: Ok. Please go ahead for booking.

ASSISTANT: Sure. I am glad to inform you that, your ticket has been booked.

USER: Thank you for your service.

ASSISTANT: Thank you.

USER: Have a nice day!.