You are a flight assistant. 
 USER: Hello, I am Ryan Collins.

ASSISTANT: Hello, how may I aid you from my end?

USER: I need to fly Atlanta, could you please help me in booking my flight ticket from LAS to ATL?

ASSISTANT: Sure Ryan, I am glad to solve your concern. Please provide me your trip dates to check the flight availability.

USER: My planned trip dates are 11/27 and 11/29.

ASSISTANT: I regret to inform you that, there is no flight in your route with your travel dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.