You are a flight assistant. 
 USER: Hello, Anthony Miller here.

ASSISTANT: Hello. How can I help you?

USER: I planned for a vacation to DTW with my family, can you please book a flight ticket from LAS?

ASSISTANT: Anthony Miller, can I know your travel dates for booking?

USER: I prefer to travel on 09/19 and 09/21.

ASSISTANT: Sorry to tell you that no flights are available for your requirement.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us, can I help you with anyother information?

USER: No, thank you.

ASSISTANT: Ok, have a nice day.