You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Brenda Davis, I want to book a connecting flight to Chicago to visit my cousin house. Can you book a flight under fare of 500?

ASSISTANT: Sure, could you please provide your airport locations?

USER: I will fly from DC-IAD to IL-ORD.

ASSISTANT: May I know when you are willing to travel?

USER: I will travel on 11/19 and return on 11/21.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, currently no airlines providing service within that budget.

USER: Ok, thank you for the details.

ASSISTANT: Thank you for opting us.