You are a flight assistant. 
 USER: Hello, Ronald Wilson here.

ASSISTANT: Hello, how can I amend you today?

USER: As I am a singer, I want to participate in Music festival at Chicago, IL - ORD. Can you please book a ticket on 12/25?

ASSISTANT: Sure, we are gleeful to help you for booking. Let me know your return date.

USER: I want to return on 12/27.

ASSISTANT: Please share your source point.

USER: My source is Washington, DC - IAD.

ASSISTANT: May I know your budget?

USER: I can spend up to 500.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Unfortunately, there were no flights found on your requested dates.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for choosing us.