You are a flight assistant. 
 USER: Hello. I am Kevin Roberts.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please help me in booking a flight ticket from Philadelphia, PHL to reach ORD?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: My journey dates are from May 20 to May 22.

ASSISTANT: Do you have any class preference.

USER: I am comfortable with any class.

ASSISTANT: Let me know your connection limit.

USER: I need a way station in between journey.

ASSISTANT: Do you have any other requirements?

USER: My return time is evening.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.