You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Janet Jackson here. I would like to travel from WA-SEA to IL-ORD, can you please help me to book a ticket?

ASSISTANT: Sure. Please let me know your journey dates.

USER: Sure, my preferable dates are from 09/03 to 09/05. Please make sure that price is 200.

ASSISTANT: Janet, there is a flight available with Southwest airlines matching with your preferences. Shall I book the ticket?

USER: Please book it for me.

ASSISTANT: Your ticket is booked with flight 1021 and the price is 300.

USER: Thank you for your support.

ASSISTANT: Thank you for reaching us.

USER: Please don't book it, because my price is 200.

ASSISTANT: Sorry for the mistake, I am cancelling your ticket.

USER: Ok.

ASSISTANT: Thank you.

USER: Welcome.