You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to attend a cultural event at Las Vegas, can you help me to book a flight ticket from IAD to LAS?

ASSISTANT: Please share your trip dates?

USER: My travel dates are 27 to 29 of Mar.

ASSISTANT: Do you have any connecting flight preferences?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: I am Stephanie Adams.

ASSISTANT: No flights found as per your preferences at the moment.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.