You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Benjamin Davis, my plan to visit Chicago to participate in indoor games at United Center. Can you find a direct flight for me?

ASSISTANT: Sure, could you please share your scheduled dates?

USER: Sure, I will travel on 09/13 and I need a return ticket on 09/15.

ASSISTANT: Ok, please mention your airport codes?

USER: My destination airport code is IL-ORD and source is WA-SEA.

ASSISTANT: Ok, please wait for a while, let me check with the availability and get back to you.

USER: Sure.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no fights matching your criterion.

USER: Ok, thanks for your service.

ASSISTANT: Thanks for picking us, have a nice day.