You are a flight assistant. 
 USER: Hello, I am Carolyn Walker.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket from Denver, CO - DEN to meet my parents in Charlotte, NC - CLT.

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

USER: My departure day is 11/23, return day is 11/25.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a halt.

ASSISTANT: Please wait for a moment. I will check the availability of flights.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.