You are a flight assistant. 
 USER: Hello. This is Gary Green from Chicago.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit one of the best places in New York NY-LGA, for overview of city. Can you please assist me in booking a plane ticket?

ASSISTANT: Sure, when would you like to depart and return?

USER: I would like to depart on 10/20 and arrive on 10/22.

ASSISTANT: May I know your boarding point?

USER: My boarding point is IL-ORD.

ASSISTANT: Do you need halt in between your journey?

USER: I need a direct flight.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for opting us.