You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am looking to book a flight ticket from DEN to CLT. Can you help me for that?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travelling dates are Mar 19 and Mar 21.

ASSISTANT: May I know your connection limit?

USER: I prefer to book a single connecting flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: No.

ASSISTANT: May I know your name to proceed further?

USER: My name is Stephen Anderson.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us.