You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a connected flight to Philadelphia, PHL to attend for a live concert. Can you please help me for booking?

ASSISTANT: Sure, may I know your boarding point?

USER: My boarding point is Washington, IAD.

ASSISTANT: Can you please share your planned travel dates?

USER: My travelling dates are Dec 10 and Dec 12.

ASSISTANT: Do you have any other requirements?

USER: Yes, I prefer economy class.

ASSISTANT: May I know your name please?

USER: Sure, I am Kathleen Carter.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.