You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me to book a flight ticket from LGA to ATL?

ASSISTANT: Ok, may I know your trip dates?

USER: My travelling dates are June 20 to June 22.

ASSISTANT: Ok, could I have your name please?

USER: Kevin Green.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight on your requesting travelling dates.

USER: No problem, thank you.

ASSISTANT: You are welcome, have a great day.