You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Stephen Smith.

ASSISTANT: Smith, nice to meet you.

USER: I want to book a ticket from DTW to visit LAS to meet my family.

ASSISTANT: Sure, could you please mention your preferable dates?

USER: My departure date is 06/23 and return on 06/25.

ASSISTANT: Please wait for a while.

USER: Make sure the connection limit is 0.

ASSISTANT: Sorry Smith, there is no flight is available as per your travelling details.

USER: It's ok, thanks for your help.

ASSISTANT: You are welcome. Have a safe flight.