You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Cynthia Jones. I need to schedule my trip to Chicago for attending my business partner marriage. Could you please help me in booking the ticket from PHL to ORD?

ASSISTANT: Sure, we are willing to help you.

USER: Thank you.

ASSISTANT: Can you please help me with your departure and arrival date?

USER: My travelling dates are 07/21 and return on 07/23.

ASSISTANT: Ok, how much can you pay for this reservation?

USER: I can pay up to 500.

ASSISTANT: Ok, let me check the availability.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available as per your requested details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for contacting us.