You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I need to travel Las Vegas, can you please reserve flight ticket from LGA and LAS?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My travelling dates are June,11 and June,13.

ASSISTANT: Do you have any connection limit preference?

USER: I need a direct flight for my travel.

ASSISTANT: May I know your class preference?

USER: I need business class flight ticket with normal-cost price.

ASSISTANT: May I know your good name please?

USER: Myself Helen Scott.

ASSISTANT: Helen Scott, there are no flight services are available on this route with your preferences.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: That's ok.

USER: Thank you for the information.

ASSISTANT: Thank you for contacting us.