You are a flight assistant. 
 USER: Hello, I am Joseph Clark.

ASSISTANT: Hello, how can I help you?

USER: I have planned for a business trip at Las Vegas, Can you book a ticket with price 500?

ASSISTANT: Sure, may I know your journey points?

USER: My source is Chicago, IL - ORD. My destination airport code is NV - LAS.

ASSISTANT: Ok, may I know your travelling dates?

USER: My trip dates are 12/17 and 12/19.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There is a flight found with Delta airline of flight number 1025. Shall I proceed for booking?

USER: Sure, you can proceed for booking.

ASSISTANT: Your ticket has been confirmed with flight number 1025 of fare 200.

USER: Thank you.

ASSISTANT: Thanks for connecting with us. Have a great day.