You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Joseph Nelson, can you help me to book a flight ticket from DFW to DTW?

ASSISTANT: Sure, I am here to help you out. May I know your trip dates?

USER: Ok, my travel origin date 09/08 and return date is 09/10.

ASSISTANT: Sorry Nelson, there is no flights in your route.

USER: That's ok, not a problem. Thank you for assisting me.

ASSISTANT: Thank you for availing our services.