You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I need a ticket from Washington DC-IAD to Philadelphia, PA-PHL.

ASSISTANT: Sure, Kindly mention your travelling dates?

USER: Travelling dates are from 07/14 to 07/16.

ASSISTANT: How much you can spend for ticket fare?

USER: Price limit is 500.

ASSISTANT: Do you need any specifications in connection?

USER: Please provide direct flight.

ASSISTANT: Sorry, there is no direct flight found on your requested dates. May I know your good name please?

USER: I am Scott Nelson. Thanks.