You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I need to book a flight ticket from PHL to ORD, can you help me in booking a flight ticket?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, my departure and arrival dates are Feb 28 and Mar 1.

ASSISTANT: Ok, could I have your name please?

USER: Sure, Carolyn Collins here.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer maximum one connection.

ASSISTANT: Ok, do you have any other specifications?

USER: I would prefer depart time at afternoon.

ASSISTANT: Sorry, there is no flight with your requested time.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: You are welcome, have a great day.