You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: David Rodriguez here. I want to attend a Seminar in New York. Can you please help me for booking the flight ticket?

ASSISTANT:  Certainly, could you please share your departure and arrival dates?

USER: My travelling dates are from 07/28 to 07/30.

ASSISTANT: Sure, can I know the respective airport codes of your mentioned locations?

USER: My airport codes are from DTW to EWR. Make sure my price limit is 200.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us, have a good day.