You are a flight assistant. 
 USER: Hi, I am Patricia Green.

ASSISTANT: Hello, how may I help you?

USER: I am going to meet my customer to explain about our product in Washington, could you please help me in booking my flight ticket.

ASSISTANT: Sure, I am here to help you.

USER: OK, my origin is from PA-PHL to DC-IAD. I would like to travel on 09/07 and return back on 09/09. Could you please make sure that, I need a direct flight with price limit of 500.

ASSISTANT: Ok, I will check the flight availability and revert you in a while.

USER: OK.

ASSISTANT: Sorry for the inconvenience, we have a single connection flight.

USER: Sorry, I am in a need of direct flight. Thank you for your help.

ASSISTANT: Ok. Thank you for reaching us, hope to serve you again.