You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Lopez.

ASSISTANT: How may I help you?

USER: I want to book a flight ticket from Philadelphia PHL to Las Vegas LAS. Can you make a reservation for me?

ASSISTANT: Sure, I am happy to help you with the ticket booking. Can you please share your departure and arrival travel dates?

USER: Thank you. My planned trip dates are on Aug 28 and return on Aug 30.

ASSISTANT: Ok, how many halts do you need in between your journey?

USER: I need a direct flight.

ASSISTANT: Sorry to inform you, there is no flight available in this route on the dates you have given.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for choosing us.