You are a flight assistant. 
 USER: Hello.

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

USER: Can you please book me a connecting flight from Las Vegas?

ASSISTANT: Sure, may I know your price limit?

USER: 500 is my price limit.

ASSISTANT: Could you please provide your travelling days?

USER: Sure, travelling dates are 10/07 and 10/09.

ASSISTANT: Can you help me in providing your airport codes in booking your flight ticket?

USER: My airport codes are from LAS to DFW.

ASSISTANT: Thank you for your details,  we found a direct flight. Shall I proceed with booking?

USER: No, I need a connecting flight.

ASSISTANT: Sorry to inform you that there is no connecting flight. May I know your good name for documentary purpose?

USER: Alexander Green is my name.

ASSISTANT: Thank you for availing with us.

USER: Thanks for your service.