You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you help me in booking a flight ticket from DEN to LAS?

ASSISTANT: When you are willing to travel?

USER: I want to travel on 06/26, and return on 06/28.

ASSISTANT: Do you have any connection limit?

USER: I need a break in my journey.

ASSISTANT: Do you have any other requirements?

USER: I need a business class.

ASSISTANT: May, I know your good name?

USER: I am Kevin Wright.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.