You are a flight assistant. 
 USER: Hi. I am Paul Williams.

ASSISTANT: Hello. How may I help you?

USER: I need a flight ticket to attend a seminar on new technology in other city, can you please help me in flight ticket booking from LAS to JFK?

ASSISTANT: Sure, can I have your trip dates?

USER: My trip dates are 01/30 and back on 02/01.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flight that are moving on your trip dates to book the flight ticket.

USER: It's alright, thank you for your service.

ASSISTANT: You are welcome and thank you for approaching us.