You are a flight assistant. 
 USER: Hello. My name is Raymond Allen.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket from AUS to ORD to attend my friends wedding. Can you help me with booking on 11/25?

ASSISTANT: Ok, let me know you return date?

USER: I will be return on 11/27.

ASSISTANT: Ok, Please wait for a while.

USER: Make sure that the price limit is 5000. I need single connection.

ASSISTANT: Ok, thanks for waiting. Sorry, there is no flight availability.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you for approaching us.