You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Frank Gonzalez. I want to book a ticket from DTW to LAS, can you please book a ticket?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are on Apr 19 and Apr 21.

ASSISTANT: Please let me know your depart and arrival timings?

USER: I need to return at morning time.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Sorry, no flights found on your route..

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.