You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I am planning to book a ticket from DTW to AUS. Can you please help me out?

ASSISTANT: Sure, we are glad to help you. May I know your planned dates please?

USER: I am planning to travel on July 21 and return back on July 23.

ASSISTANT: Ok, help me with your connection limit.

USER: I am looking for a connection flight.

ASSISTANT: Can I have your good name please?

USER: My name is Amy Johnson.

ASSISTANT: Do you have any other concerns to say?

USER: I am looking for a business class.

ASSISTANT: Ok, wait for a few minutes.

USER: Sure.

ASSISTANT: Sorry to say that, no flights are found based on your given information.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.