You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello!.

USER: This is Robert Thomas.

ASSISTANT: how may I help you?

USER: Can you help me for booking a flight ticket from NY-JFK to IL-ORD?

ASSISTANT: OK,can you please tell me your travel dates?

USER: My departure day is 04/23 and return day is 04/25.

ASSISTANT: There is a flight with matching dates and the price is 500 with connection limit 1. may I proceed with this ticket?

USER: Sorry my budget range is 200,please don't book this.

ASSISTANT: Sorry! no flights found on your budget.Thank you have a nice day.