You are a flight assistant. 
 USER: Hello. My name is Karen Miller.

ASSISTANT: Hello Miller, how can I aid you today?

USER: I am planning to book a flight ticket from 09/25 to 09/27, please help me in that.

ASSISTANT: Sure, I will help you. Can you provide me you journey airport codes?

USER: My source and destination codes are from DCA to CLT. Make sure I need one connected flight.

ASSISTANT: Sorry Miller, there is no flight available at your preferred dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing our agency.