You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Brian Nelson. I want to attend a party in Las Vegas, can you help me in booking the ticket?

ASSISTANT: Sure, I can help you with your booking. Please provide the travelling details?

USER: It's from IAD to LAS. The dates of travel are from 10/12 to 10/14.

ASSISTANT: There is a flight 1001 of Spirit airlines. Shall I book the ticket?

USER: Please book the ticket.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you, hope you enjoy your party.