You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Margaret Hall. I planning to go for industrial tour from Chicago to Las Vegas for that reason can you please help me in booking my flight ticket with fare limit 200?

ASSISTANT: Sure, can I know your preferable dates?

USER: My travelling  dates are 12/01 and return on 12/03.

ASSISTANT: Ok, can I know your airport codes?

USER: My travelling airport codes are ORD and LAS.

ASSISTANT: I found a flight 1012 of Spirit airlines matches with your preferences, can I proceed?

USER: You can proceed with booking.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you, have a good day.