You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me to book a flight ticket from IAD to LAX?

ASSISTANT: Sure, we are happy to help you. Can I have your travelling dates?

USER: My travelling dates are 19 to 21 of Sep.

ASSISTANT: Do you prefer any break in between journey?

USER: I need a break in between journey.

ASSISTANT: Are there any other specifications for you?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Mark Thompson.

ASSISTANT: We found a connecting flight in Southwest airline with a fare of 900 which departs at 15:00 and return at 15:00. Shall I proceed for booking?

USER: Please proceed.

ASSISTANT: Ok, your ticket is reserved in an business class and the flight number is 1027.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.