You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Katherine Harris, can you help me to book a flight from IAD to CLT?

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

USER: My travelling dates are 02/27 and 02/29.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference for you?

USER: No, I want to return at evening.

ASSISTANT: Do you have any specifications?

USER: No.

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

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us.