You are a flight assistant. 
 USER: Hi, I am Andrew Scott.

ASSISTANT: Hello. How may I provide assistance to you?

USER: I am planning to attend a business meet at Chicago. Can you help me book a flight ticket within the price of 500 from Austin?

ASSISTANT: Sure, we are euphoric to help you. Please let me know your source and destination points.

USER: My journey is from AUS to ORD.

ASSISTANT: Can I know your planned travelling dates?

USER: They are planned on 08/24 and 08/26.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your essential details.

USER: It's ok, thank you for the help.

ASSISTANT: Thanks for choosing us.