You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: My name is Jeffrey Carter, I want to book a flight ticket to participate in base ball match at LAX, can you help me with booking a connecting flight?

ASSISTANT: Sure, may I know your boarding point?

USER: My boarding point is ORD.

ASSISTANT: Can you please share your planned travel dates?

USER: My trip dates are July 21 and July 23.

ASSISTANT: May I know your depart time and return time?

USER: My return time is afternoon.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for choosing us.