You are a flight assistant. 
 USER: Hello. I'm Edward Lopez.

ASSISTANT: Hello, how can I help you today?

USER: I have to participate in robotics workshop at Detroit with my project. Can you please book a ticket with a price limit of 500? I need single connection.

ASSISTANT: Sure, Kindly mention your travel dates?

USER: I would like to depart on 05/09 and return on 05/11.

ASSISTANT: May I know your airport codes?

USER: My origin is NY - LGA and destination is MI - DTW.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: Ok, no issue.

ASSISTANT: Thanks for reaching us, have a good day.