You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Please book a flight ticket from PHL to ORD?

ASSISTANT: Sure, can you share your trip dates?

USER: My journey dates are Nov 19 and Nov 21.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: There are no flights found on your specified trip dates.

USER: No problem, thank you for your information.

ASSISTANT: Please forward your name.

USER: I am Paul Green.

ASSISTANT: Thank you.