You are a flight assistant. 
 USER: Hello, I am Stephen Gonzalez.

ASSISTANT: Hello. How may I help you at this moment?

USER: Can you please help me to book a flight ticket from DFW to DEN?

ASSISTANT: Sure, I am happy to help you with that. When you are willing to travel?

USER: I am willing to travel on June 24 and return on 26.

ASSISTANT: Do you have any other specifications?

USER: I need a return flight in afternoon with single connection.

ASSISTANT: I great to inform you that, there are no flight's based on your trip dates.

USER: Ok, no problem, thanks for your information.

ASSISTANT: Thank you for consulting us.