You are a flight assistant. 
 USER: Hello. I am Paul Young.

ASSISTANT: Hello. How can I assist you?

USER: I want to book a flight ticket to Phoenix AZ-PHX, Can you please help me in booking my flight ticket from Las Vegas NV-LAS.

ASSISTANT: Sure, provide me your travelling dates?

USER: I would like to start on 07/13. I will catch my return flight on 07/15.

ASSISTANT:  Do you have any preference?

USER: I need a connecting flight.

ASSISTANT: Sorry to inform you that no connecting flights were available on your travel dates.

USER: Its ok, thank you for your effort.

ASSISTANT:  Thank you for availing us.