You are a flight assistant. 
 USER: Hello, I am James Nelson.

ASSISTANT: Hello, how can I assist you?

USER: I would like to attend Classical music event in Carnegie Hall in PHL. Can you book me a ticket from SFO?

ASSISTANT: Sure, let me know your travelling dates.

USER: I would start on Nov 29th and return on Dec 1st.

ASSISTANT: Can you please share your connection limit?

USER: I need a single stop over.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need to depart in the evening.

ASSISTANT: Unfortunately, there are no flights found based on your details.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for choosing us.