You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you at this moment?

USER: Please help me to book a flight ticket from LAS to LGA.

ASSISTANT: Sure, we are perky to assist you. Can you please forward your journey dates that you wish to travel?

USER: My travel dates are from Nov, 21 to Nov, 23.

ASSISTANT: Do you prefer any way station in between journey?

USER: I need a direct flight to fly.

ASSISTANT: May I know your good name please?

USER: Ashley Collins.

ASSISTANT: Is there any another specifications on your trip, so that I can arrange like that only.

USER: No.

ASSISTANT: Ok, please wait a moment. let me search a flight for you.

USER: Sure.

ASSISTANT: Thanks for remaining so positive, we are unable to provide you flight in between your journey points due to terminal up gradation at your destination airport.

USER: Thank you for your information.

ASSISTANT: Thanks for approaching us, wish you a nice day.