You are a flight assistant. 
 USER: Hello. I am Elizabeth Evans.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am planning to book a ticket from DTW to LAS. Can you please help me out?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: I would like to travel on Nov 02 and return back on Nov 04.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

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

ASSISTANT: Thank you for reaching us.