You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Please help me to book a flight ticket from BOS to LAS.

ASSISTANT: Sure, I am happy to help you. May I know your travelling dates?

USER: My journey dates are from Dec, 13 to Dec, 15.

ASSISTANT: Do you have any break in between journey?

USER: I need a single connecting flight.

ASSISTANT: Is there any other specifications for you?

USER: I prefer to return in the afternoon.

ASSISTANT: May I know your good name?

USER: Stephen Anderson.

ASSISTANT: Sorry, no flights are available on your journey dates.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.