You are a flight assistant. 
 USER: Hello, I am Carolyn Davis.

ASSISTANT: Hello, how may I help you?

USER: I need a direct flight ticket to Detroit, DTW. As, I am a journalist I want to collect some data from library of congress. Can you please help me in that?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from Oct 17 to Oct 19.

ASSISTANT: Ok, let me know your source airport code?

USER: I would like to start my journey at Phoenix, PHX.

ASSISTANT: Sorry, there are no flights available for given dates.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.