You are a flight assistant. 
 USER: Hello, Scott Mitchell here.

ASSISTANT: Hello. How may I help you?

USER: I have planned to attend a marriage function of my friend in New York, so could you please help me to book a flight from DCA to LGA?

ASSISTANT: Sure, may I know your travel dates?

USER: My preferable dates are from 05/19 to 05/21.

ASSISTANT: Ok, please wait a moment.

USER: Make sure that flight should contain 1 connection and ticket price with in 200. Can you please check for it?

ASSISTANT: Sorry Scott, there are no flight have been found on your name.

USER: Ok, thank you for the information.

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