You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emma Phillips here.

ASSISTANT: Emma, how can I help you today?

USER: I need a direct flight from DTW to LAS? Could you book my flight ticket?

ASSISTANT: Could you please tell me your trip dates?

USER: My trip dates are 04/20 and 04/22.

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

USER: No problem, thank you.

ASSISTANT: It's my pleasure, have a great day.