You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Michael Davis. I am planning to book a ticket to attend a meeting at AUS. Can you please help me out from DTW?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: I would like to travel on Dec 25 and return back on Dec 27.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's fine, thank you for your service.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.