You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Andrew Baker, I am planning to meet my friends from PA-PHL to IL-ORD. Can you please help me out?

ASSISTANT: Sure, could you please provide the travel dates?

USER: The travelling dates are from 07/12 to 07/14.

ASSISTANT: Sorry, there are no flights found on your dates.

USER: OK, It's fine. Thank you for your information.

ASSISTANT: You are welcome. Have a nice day!.