You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Jeffrey Mitchell here. I want to travel from New York to Las Vegas for attending an Agricultural meeting. Can you please help me for booking the flight ticket?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are from 02/17 to 02/19.

ASSISTANT: Please share your preferred airport codes.

USER: My airport codes are from LGA to LAS.

ASSISTANT: Please wait a while.

USER: Ok, I will wait.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.