You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please book me a plane ticket from DTW to LAX?

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

USER: Sure, my trip dates are from 12/01 to 12/03.

ASSISTANT: Sorry, all flights are busy on your planned trip dates.

USER: No problem.

ASSISTANT: May I know your name please?

USER: My name is Margaret Hall. Thank you for the information.

ASSISTANT: My pleasure.