You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need you to book a flight ticket from LAS to CLT.

ASSISTANT: Sure, may I know your name?

USER: My name is Virginia Roberts.

ASSISTANT: Can I know your travelling dates?

USER: Dec-21 and 23 are the respective airport codes.

ASSISTANT: Do you have any other specifications?

USER: I wish to depart in the afternoon.

ASSISTANT: May I know your connection limit?

USER: I need a break in my journey.

ASSISTANT: Sorry, there are no flights available on your request.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.