You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Can you find a flight for me in a economy class?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: Ok, my trip dates are from May 12 to 14.

ASSISTANT: May I know your name?

USER: Sure, I am Brenda Nelson.

ASSISTANT: Do you have any other requirements?

USER: I would like to return in the evening time with single connection.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are from DTW to AUS.

ASSISTANT: Ok, wait for a minute. Sorry to say that, there are no flights available based on your travelling dates.

USER: Ok. Thanks for your information.

ASSISTANT: Thank you for approaching us.