You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planing to visit Chicago, so could you please help me to  book a flight ticket from PHL to ORD?

ASSISTANT: Sure, I can help you with that. Please provide the travelling dates?

USER: My  departure date is 12/04 and my return date is 12/06. Make sure  that connections should be 0.

ASSISTANT: Sorry, there is no flight with 0 connection. May I know your name please?

USER: I am Richard Evans. Thank you.

ASSISTANT: Thank you for contacting us.Have a nice day.