You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What service do you expect from our agency?

USER: I want to book a flight ticket from Las Vegas LAS to DCA. Can you find a flight ticket for me?

ASSISTANT: Sure, can I know your preferable journey dates?

USER: Ok, my planned trip dates are on June 19 and return on June 21.

ASSISTANT: Do you prefer an economy class or a business class?

USER: I want an economy class flight.

ASSISTANT: Ok, please share your connection limit preference.

USER: I need a single connecting flight to travel.

ASSISTANT: Can you please tell me your full name?

USER: Ok, I am Laura Lewis.

ASSISTANT: Sorry to inform you that, there are no flights found in this route on your travel details.

USER: Ok, not an problem with that. Thank you for your information.

ASSISTANT: You are most welcome. Thank you for choosing us.