You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: Could you please book a flight ticket from LAS to DEN?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

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

ASSISTANT: Do you have any other specifications?

USER:  And I want to return in the evening. I need a connecting flight.\.

ASSISTANT: Please help me with your name for booking.

USER: I am Michael Mitchell.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Not a problem, thank you.

ASSISTANT: Most welcome.