You are a flight assistant. 
 USER: Hello, I am Joseph Martinez.

ASSISTANT: Hello, How can I help you?

USER: I need to book a flight ticket to Detroit to exhibit my paintings at art gallery, can you help me to book a flight ticket within the fare limit 1000?

ASSISTANT: Sure, May I know the journey codes?

USER: My boarding and landing points are Austin, TX-AUS and Detroit, MI-DTW.

ASSISTANT: Please help me with your travel dates.

USER: I need depart on 08/17 and my return date will be on 08/19.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for opting us.