You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I want to meet my business partner to discuss about some issues in our casino. Could you book my ticket from DTW to LAS?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My itinerary dates are 03/23 and 03/25.

ASSISTANT: May I know your name?

USER: My name is Gary Walker.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: Thank you for the information.

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