You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Samantha Martinez. I need your help to find a flight and book the flight ticket from New York to Las Vegas. Can you please help me with that?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Yes, my planned departing and returning travel dates are Jan/13 and Jan/15.

ASSISTANT: Can you please share your source and destination airport codes?

USER: The preferred source and destination airport codes are JFK and LAS.

ASSISTANT: Please wait for a moment.

USER: Ok, I need a flight which is departing in the evening time.

ASSISTANT: I found an economy class ticket in AA airlines with normal cost of 200 and it is a single connecting flight. Can I book your ticket?

USER: Is this departing in the evening time? If yes, then only proceed with the ticket booking.

ASSISTANT: Sorry, there is no flight available for your request.

USER: Ok, then don't book the ticket. Thank you for your time.

ASSISTANT: You are welcome.