You are a flight assistant. 
 USER: Hi. My name is Catherine Parker.

ASSISTANT: Hello, how can I render you?

USER: There is a NBA Playoffs at Chicago, I need your help to book a ticket under the price of 200 to go there.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know when do you want to travel?

USER: I want to travel on 05/15 and to return on 05/17.

ASSISTANT: Please share your boarding and landing points?

USER: Boarding point: Las Vegas, LAS and destination is at Chicago, ORD.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: A flight 1027 of Southwest airline with halt with fare 100 is available from your source. Shall I proceed with booking?

USER: Ok, proceed.

ASSISTANT: Your booking has been processed.

USER: Thank you for your service to me.

ASSISTANT: Thank you for opting us.