You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Margaret Young. Can you please help me in booking a ticket to  New York, NY-EWR from Washington, DC-IAD?

ASSISTANT: Sure, Please share your planned trip dates?

USER: My planned trip dates are from 07/15 to 07/17.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a connecting flight with fare 200.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.