You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to attend a Tennis competition in Detroit DTW from LAS. Can you find a flight ticket for me?

ASSISTANT: Sure. Tell me your travel dates please?

USER: Ok, my itinerary dates are on Jan 12 and return on Jan 14.

ASSISTANT: Are you looking for a stopover in your journey?

USER: I need a single connecting flight.

ASSISTANT: Any other preferences?

USER: Yes, I want to depart in the evening time and return in the evening time.

ASSISTANT: May I know your name please?

USER: Yes, I am Dennis Jones.

ASSISTANT: Please wait.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

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

ASSISTANT: Thank you.