You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend my college reunion meeting. Can you check the flight availability from DTW -IAD?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My planned travel dates are 09/16 and 09/18.

ASSISTANT: May i know your class preference please?

USER: I want only direct flight, no more specifications please.

ASSISTANT: Ok, can I have your good name please?

USER: Sure, Eric Lee here.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no direct flights available for you on those dates with your given details.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for choosing us.