You are a flight assistant. 
 USER: Hello, I am Dennis Anderson.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from IL - ORD to IL - ORD. I will be fly on 04/21 and recur on 04/23.

ASSISTANT: Sure, Please wait a moment, I will check the availability and get you back.

USER: Sure.

ASSISTANT: Thank you for waiting, We found Southwest airline with flight number 1000 and price 100 matched your requirements. Shall I proceed for booking?

USER: Ok, you can proceed.

ASSISTANT: Your booking has been done.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for reaching us, Have a nice journey.