You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Can you please help me in booking my flight ticket from MSP to DEN?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travelling dates are Sept 30 and Oct 02.

ASSISTANT: Do you have any preferences?

USER: I need depart ticket at afternoon time and I prefer my return ticket at evening time.

ASSISTANT: May I know your name please?

USER: Myself Dennis Martinez.

ASSISTANT: Sorry, there is no flight available with your journey dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome, have a nice day.