You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Donna Smith here, please book me a flight from AUS to DTW.

ASSISTANT: Sure, I will help you. Can you please provide me your travel dates?

USER: My trip dates are from 02/22 to 02/24.

ASSISTANT: Ok, please wait for a while.

USER: Make sure my price limit is 200.

ASSISTANT: Sorry Smith, I did not find any flight available with the ticket fare of 200.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome and thank you for choosing us.