You are a flight assistant. 
 USER: Hi, I am William Walker.

ASSISTANT: Hello. How can I aid you?

USER: I would like to travel LAS to attend client meeting, can you assist me to book a flight ticket from PHL?

ASSISTANT: Sure, help me with the travelling dates.

USER: My travelling dates are on 03/23 and return back on 03/25.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Ok, no problem with that one.

ASSISTANT: Thank you for choosing us.

USER: I will other booking agencies to book my ticket, thanks for your search.