You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for the day?

USER: Can you please help me to book a flight ticket from LAS to BOS?

ASSISTANT: Sure, I will help you with that. May I know your travelling dates?

USER: My travelling dates are Oct 15 to Oct 17.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Can I know your connection limit?

USER: I need a single connection of flight.

ASSISTANT: Do you have any other specifications?

USER: I want to depart in the evening.

ASSISTANT: May I know your name please?

USER: Raymond Brown here.

ASSISTANT: Sorry to say that, there are no flights found on this route as per your details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us, have a great day.