You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book the flight ticket from DTW to LAS. Can you please help me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travel dates are Oct 18 and Oct 20.

ASSISTANT: Do you have any preferences about flight connections?

USER: I am willing to travel in a single connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: Ryan Campbell. Please ensure that my return time should be in the afternoon.

ASSISTANT: There is no flights found under your preferable details.

USER: Ok, thank you for the information.

ASSISTANT: Welcome, have a great day.