You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you aid me to book a flight ticket from LAS to EWR?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are June 25 and June 27 respectively.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: Margaret Allen here.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: Thank you for the help.

ASSISTANT: Thank you for opting us.