You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Carolyn Perez. I want to book a flight ticket with price limit of 200 for celebrating my birthday in Chicago.

ASSISTANT: Sure. Please provide journey details?

USER: My departure day is 09/21, return day is 09/23. My source and destinations are WA-SEA, IL-ORD.

ASSISTANT: We did not found any flights matching your details. Thanks for choosing us.

USER: Ok, no issues, thank you.