You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: Ruth Green here.

ASSISTANT: Welcome to flight booking agency Ruth Green.

USER: Can to book a ticket from LAS to JFK.

ASSISTANT: Sure, I will help you with that. Can you please provide your departure and return dates of travelling?

USER: My travelling dates are Apr 02 to Apr 04.

ASSISTANT: Please hold on a moment to check the flights on your route.

USER: Ok.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.