You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Dorothy King here. I want to visit Denver Zoo, could you book my ticket from MSP to DEN?

ASSISTANT: Sure, can I know the travel dates please?

USER: My trip dates are 06/23 and 06/25.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry King, there are no flights available on your dates.

USER: No problem, thank you for helping me.

ASSISTANT: Thank you for approaching us.