You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight from CLT to PHL?

ASSISTANT: Sure, let me know your trip dates please?

USER: Sure, I want to travel on May 24 and need to return on May 26.

ASSISTANT: May I know your connection limit?

USER: I am looking for a flight with single connection.

ASSISTANT: Do you need any other preference?

USER: I prefer an economy class to travel.

ASSISTANT: Can I know your name please?

USER: My name is Kathleen Lewis.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates. Thanks for contacting us.

USER: That's ok, thank you for the information.

ASSISTANT: Most welcome.