You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Ronald Hernandez, I want to book a direct flight to attend a emergency case. Can you please help me in booking my flight ticket from Las Vegas NV-LAS to NY-LGA.

ASSISTANT: Sure, May I know the journey dates?

USER: 09/24 to 09/26 are my travelling dates.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.