You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight from DCA to meet my friend. Can you help me with book a flight to PHL?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I will fly on Sept 05 and return on Sept 07.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight? May I know your good name please?

USER: I prefer a connecting flight. My name is Katherine Lee.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, thank you for information.

ASSISTANT: Thank you for your information.