You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to meet my best friend at Las Vegas, please help me in booking a ticket from ORD to LAS.

ASSISTANT: Sure, can I have your travelling dates?

USER: My planned journey dates are on Apr 03 and Apr 05.

ASSISTANT: May I know your name, please?

USER: My name is Jerry Brown.

ASSISTANT: There is a connecting flight 1021 of UA airlines, can I proceed?

USER: Ok, please proceed for booking.

ASSISTANT: Your booking is done.

USER: Thank you for your assistance.

ASSISTANT: Welcome.