You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you? May I know your good name?

USER: I am Donald Thompson. I planed to visit my college friend at New York,NY-LGA on 04/28. I will fly from Washington DC-IAD and return on 04/30. I need a flight of price 500.

ASSISTANT: Sure, please wait a while, let me check and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, we are happy to inform you that, there is a flight form spirit airlines. Flight number 1024, price is 200 with single connection. Shall I confirm your booking?

USER: Sure.

ASSISTANT: Your ticket has been booked.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us. Have a nice day.