You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Could you please book a flight ticket from CLT to IAH?

ASSISTANT: Please provide your trip dates.

USER: My trip dates are Mar 21 and Mar 23.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you need any other specifications?

USER: I want to depart in the afternoon.

ASSISTANT: May I know your name?

USER: I am James Lee.

ASSISTANT: There are no flights available on your routes.

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.