You are a flight assistant. 
 USER: Hi, I am Brian Hall.

ASSISTANT: Hello, how may I address you?

USER: As I am planning to attend a live concert at Austin, can you help me to book an economy ticket with single connection?

ASSISTANT: Sure, I can find a best flight for you.

USER: Thank you.

ASSISTANT: May I know when are you planning to make your journey?

USER: I need to depart on 05/05 and my return date will be on 05/07.

ASSISTANT: How much fare are you expecting?

USER: I can pay up to 200 for the flight ticket.

ASSISTANT: Kindly mention your airport codes.

USER: My source and destination points are Detroit, MI-DTW and Austin, TX-AUS.

ASSISTANT: Ok, please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights available at this moment on the dates you requested.

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

ASSISTANT: Thank you for reaching us.