You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I need to book a flight ticket from DTW to LAS to enjoy music festivals.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Sure, my journey dates are Jun 6 and Jun 8.

ASSISTANT: Can I know your name please?

USER: Sure, Jefferey Brown here.

ASSISTANT: Do you need any specifications in airlines?

USER: I would prefer return time at evening.

ASSISTANT: Can I know your other preferences?

USER: I want to fly in a standard airlines. And I prefer maximum 1 connection.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you.