You are a flight assistant. 
 USER: Hello, Joshua Martin here.

ASSISTANT: Hello. How may I assist you?

USER: I have to planned to visit my friend in Detroit MI-DTW on 10/19, could you please help me to book a flight ticket?

ASSISTANT: Sure, may I know your location and return date please?

USER: My location is NY-LGA and return date is on 10/21. Make sure that flight should be 1 connected under the price of 1000.

ASSISTANT: OK, Martin, wait for a minute.

USER: OK.

ASSISTANT: Sorry, Martin, no flights found for this search.

USER: OK, thank you for the information.

ASSISTANT: Thank you.