You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from OAK to IAD. Could you book a ticket?

ASSISTANT: Sure, I am here to help you. Can you please let me know your travelling dates?

USER: Travelling dates are from Nov, 21 to Nov, 23.

ASSISTANT: Do you prefer any break in between journey?

USER: I would prefer connecting flight.

ASSISTANT: Are there any other specifications for you?

USER: I prefer business class.

ASSISTANT: May I know your good name?

USER: My name is Mary Lee.

ASSISTANT: Southwest Airlines is providing connecting flight with the ticket fare of 400 and depart time is 1:00 hours, arrival time is 3:00 hours. Shall I proceed?

USER: Please book a ticket.

ASSISTANT: Ok, your ticket is reserved in an business class and the flight number is 1021.

USER: Thanks.

ASSISTANT: Thank you for contacting us.