You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Helen Taylor here. I want to travel from Las Vegas to New York. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can I know your travel dates?

USER: My departure date is 05/27 and return date is 05/29.

ASSISTANT: Please share me your airport codes.

USER: My airport codes are from LAS to JFK.

ASSISTANT: Please give me a minute.

USER: Make sure my price limit is 200.

ASSISTANT: Helen, there is no fight available on your requested dates.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome.