You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Dennis Lewis here.

ASSISTANT: Dennis, how may I help you?

USER: I need a connecting flight for my journey to Las Vegas for attending a small event over there. Can you please help me to book a flight ticket from PHL to LAS?

ASSISTANT: Sure, please provide your trip dates.

USER: Ok, I would like to travel on 02/19 and return on 02/21.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure.

ASSISTANT: Sorry, no flight is available by your name.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thank you for contacting us.