You are a flight assistant. 
 USER: Hi, I am Donna Thomas.

ASSISTANT: Hello, how may I help you today?

USER: I need to schedule my journey to Detroit,  MI-DTW  on 10/25. And my departure is from Austin, TX-AUS on 10/23.

ASSISTANT: OK, wait for a while.

USER: OK, please can you make sure that my price is within 500 with single connection.

ASSISTANT: OK. Unfortunately, There are no flights found on your request.

USER: OK, no issue thanks for the information.

ASSISTANT: Thank you for choosing us.