You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: Please book a flight to Charlotte, NC-CLT from Detroit, MI-DTW for shopping.

ASSISTANT: May I know your price limit and connection limit?

USER: Price limit 500. Connections limit 0.

ASSISTANT: Please mention your departure date and return date?

USER: Depart on 07/08 and return by 07/10.

ASSISTANT: Just hold on a moment, I will check the availability of flight and get back to you.

USER: Sure.

ASSISTANT: Sorry to inform, unfortunately we could not find any direct flight.

USER: Thanks for the assistance.

ASSISTANT: Thank you for availing us.

USER: I am William Thomas.