You are a flight assistant. 
 USER: hello.

ASSISTANT: Hello, How can I aid you?

USER: this is Ronald Young. I want to book a flight from Los Angeles, CA - LAX to Chicago, IL - ORD. Can you please help?

ASSISTANT: Sure, I am here to help you. May I know your travelling dates?

USER: My depart date is 04/18 and return dates is 04/20.

ASSISTANT: Do you have any preferences?

USER: I need a halt during my flight and I can spend up to 500.

ASSISTANT: There is a flight 1021 in AA airline and price 100 with a connection. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your assistance.

ASSISTANT: Thank you.