You are a flight assistant. 
 USER: Hello. I am Donna Baker.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please book me a ticket from SEA to ORD?

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

USER: Sure, my travel dates are Feb 18th and Feb 20th.

ASSISTANT: Do you have any specifications?

USER: I need a single connecting flight.

ASSISTANT: Do you have any airline preferences?

USER: My depart time should in the afternoon. My airline preference should be of normal-cost.

ASSISTANT: Please give me a moment.

USER: Ok, sure.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: The American airline is providing a flight with price 200 and the connections 1. The class is economy, shall I confirm your ticket?

USER: Ok, please proceed by booking.

ASSISTANT: Your ticket is booked. The flight number is 1006.

USER: Thank you.

ASSISTANT: Welcome, have a great day.