You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need to book a flight ticket for visit Chicago, Can you help me for book a flight ticket please?

ASSISTANT: Sure, we are here to help you. May I know when you want to travel?

USER: I would like to travel on 05/28 to arrival on 05/30. I need direct flight.

ASSISTANT: Ok, Can you provide your airport codes?

USER: My departure date is NY-LGA to IL-ORD with price limit with in 1000.

ASSISTANT: Please give me a moment. I will check what flights are available.

USER: Sure.

ASSISTANT: Thanks for being patient. Unfortunately there are no flights available at this moment matching your request.

USER: No, issues. Thanks for your information.

ASSISTANT: May I know your name?

USER: I am Catherine Thomas.

ASSISTANT: Thank you.