You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to attend a Seminar in Chicago. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are Sep 24 and Sep 26.

ASSISTANT: May I know your airport codes?

USER: My airport codes are DTW and ORD.

ASSISTANT: Do you have any specifications?

USER: I want to travel in economy class.

ASSISTANT: May I know your good name please?

USER: My name is Ronald Hernandez.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.