You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to book a flight ticket from CLT to LAX?

ASSISTANT: Sure. Please provide your travelling dates?

USER: Feb, 9 and Feb, 11 are my travel dates.

ASSISTANT: Do you prefer connecting flight?

USER: Yes.

ASSISTANT: Is there any preference?

USER: I need to depart at evening time.

ASSISTANT: Can I know your name?

USER: Karen Brown here.

ASSISTANT: Sorry, there are no flights for your requirement.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you.