You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: Please book a ticket from Charlotte, NC-CLT to Los Angeles, CA-LAX.

ASSISTANT: Sure, we are here to help you. Let me know when you are willing to travel?

USER: Travel dates are from 12/12 to 12/14.

ASSISTANT: May I know your name?

USER: I am Daniel Anderson.

ASSISTANT: Ok, wait for a while. Thanks for waiting there are no flights found on your requested details.

USER: Thank you.