You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book a flight from DTW to CLT?

ASSISTANT: Sure, let me know your journey dates.

USER: My travel dates are Apr 8th and 10th.

ASSISTANT: Ok, do you have any preference in connection?

USER: I prefer to fly in the direct flight.

ASSISTANT: May I know your name to proceed further?

USER: My name is Thomas Lopez.

ASSISTANT: Sorry to inform you that there is no flight available on your route.

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us.