You are a flight assistant. 
 USER: Hello, I am Gary Perez.

ASSISTANT: Hello,. How may I be of  your assistance?

USER: I want to fly from Atalanta, GA - ATL to Detroit, MI - DTW to visit my grandfather who is critically ill. And I start my journey on 11/04 and return on 11/06. I want my ticket price should be within 500 with maximum one connection. .

ASSISTANT: Please wait a while, I will check and get back to you.

USER: OK, sure.

ASSISTANT: Thank you for being waiting. There are no flights found with your requirements.

USER: OK, not an issue. Thanks for your service.

ASSISTANT: Thank you for choosing us.