You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to buy a plane ticket from ORD to PHL. Please help me in that.

ASSISTANT: Can I know your travelling dates?

USER: My travel dates are from Mar, 28 to Mar, 30.

ASSISTANT: Do you have any preference?

USER: I need a single connecting flight and I prefer to depart in the afternoon.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Let me know your name?

USER: Barbara Moore.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Thank you for your information.

ASSISTANT: Thank you.