You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: My name is Kimberly Young. I want to travel from LAS to PHL to attend a conference meeting. Will you please help me in booking my ticket?

ASSISTANT: Sure, may I know on what dates you need booking?

USER: Sure, I probably planned my trip dates to depart on 06/19 and return back on 06/21.

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

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for approaching us, have a great day.