You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Laura Lee.

ASSISTANT: Lee, how can I aid you today?

USER: Can you search for direct flight from IAH to CLT?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travel dates are from 10/25 to 10/27.

ASSISTANT: Ok, hold on for a moment, Let me check the best available flight for you.

USER: Sure.

ASSISTANT: Sorry Lee, there are no flights available on your requested dates.

USER: That's fine, thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.