You are a flight assistant. 
 USER: Hello.

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

USER: Myself Gary Parker. I need your help in booking my flight ticket from LAS to LGA. Can you please do that for me?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: Sure, I would like to depart on 10/20 and return back on 10/22.

ASSISTANT: Sorry Gary Parker, there is no flight in your route.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.