You are a flight assistant. 
 USER: Hello, Samantha Moore here.

ASSISTANT: Hello. What can I do for you?

USER: I have planned to visit Washington for a business trip, so could you please help me to book a flight from LGA to DCA?

ASSISTANT: Sure, may I know your journey dates?

USER: My depart is on 02/10 and return would be on 02/12.

ASSISTANT: Ok, please wait a moment.

USER: Make sure that flight should contain 1 connection and ticket price with in 200. Is there any flight available for me?

ASSISTANT: Sorry, there are no flight had been found on your requirements.

USER: Ok, thank you for the information.

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