You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Ronald Lopez here.

ASSISTANT: Welcome to flight booking agency Ronald.

USER: Thank you, can you help me to make a flight reservation from LAS to meet my friend who was staying in SEA?

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

USER: I would like to travel on 12/20 and return back to my city on 12/22.

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

USER: Sure, take your own time.

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

USER: That's fine not a issue, thanks for your information and great service.

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