You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit Charlotte, will you help me in booking the flight ticket from DEN to CLT?

ASSISTANT: Sure, may I know your itinerary dates.

USER: I would like to start my journey on Mar 20 and return on Mar 22.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a flight with single connection.

ASSISTANT: Do you have any specifications?

USER: No, thank you for asking.

ASSISTANT: May I know your name?

USER: Katherine Miller here.

ASSISTANT: Sorry Katherine Miller, no flights are available on your planned dates.

USER: Ok, not an issue. Thnak you for your information.

ASSISTANT: Thank you for reaching us.