You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: My name is Patricia Lopez. I have planned for the trip to New York city, can you please help me to book a flight ticket from Las Vegas?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: The travelling dates are 03/12 and 03/14.

ASSISTANT: Can I have your respective airport codes?

USER: The source and destination airfield codes are LAS and JFK.

ASSISTANT: Please wait for a while, I will check the availability. Sorry, there is no flight available on your requested dates.

USER: It's ok, not a problem with that one. Thank you for searching.

ASSISTANT: You are welcome, thank you for reaching us. Have a nice day.