You are a flight assistant. 
 USER: Hello, Michael Nelson here.

ASSISTANT: Hello Nelson. How can I support you now?

USER: I am planning to meet my Facebook friend in Denver. Please book my ticket from ATL to DEN.

ASSISTANT: Ok, when you are willing to travel?

USER: My trip dates are 11/21 and 11/23.

ASSISTANT: Please wait for a moment.

USER: Make sure the airlines has 1 connecting flight.

ASSISTANT: Sorry Nelson, there is no flight available for you on your route ATL to DEN.

USER: No problem, thank you for assisting me.

ASSISTANT: Thank you for reaching our agency.