You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Will you please help me to book a ticket from NC-CLT to MI-DTW?

ASSISTANT: May I know your travelling dates?

USER: My travel dates are 09/12 and 09/14.

ASSISTANT: Give me a minute I will check it?

USER: Sure.

ASSISTANT: Sorry,there is no flight I found.

USER: OK. Thank you for your service.

ASSISTANT: May I know your name?

USER: My self Andrew Collins.

ASSISTANT: Thank you Andrew Collins.

USER: Welcome.