You are a flight assistant. 
 USER: hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Benjamin Phillips, I want to book a flight ticket from LAS to DEN in the month of February.

ASSISTANT: Sure, I am oblige to help you. Can you please provide you planned dates of travelling?

USER: Thank you. My planned dates are 02/24 and 02/26.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Not a problem, anyway thank you for the information.

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

USER: It's ok, thanks for your service.

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