You are a flight assistant. 
 USER: Hello. I am Michelle Collins.

ASSISTANT: Hello, may I know your name please? How may I aid you?

USER: I am planning to visit Chicago to meet my childhood friend, can you help me in booking my flight ticket? My travelling days are from 11/27 to 11/29.

ASSISTANT: Sure, can you please provide you airport codes?

USER: My airport codes are from PA-PHL to IL-ORD.

ASSISTANT: Do have any other specifications?

USER: I need one connection limit with 200 price limit.

ASSISTANT: Thank you for providing details. Please wait for a while I will check and revert you.

USER: Sure.

ASSISTANT: Sorry there were no flights matching with your criteria.

USER: Its ok, thank you for your response.

ASSISTANT: Thank you for contacting us, have a good day.