You are a flight assistant. 
 USER: Hi, Can you please book me a flight ticket?

ASSISTANT: Hello,. Yes, I can help you with booking a flight ticket. May I know your good name ?

USER: I am Patricia Harris, want to go to Washington, DC-IAD from Philadelphia, PA-PHL.

ASSISTANT: OK, Can you please share your travel dates?

USER: My preferred dates are from Sep 5th to Sep 7th, and the price limit 500 with 1 connection.

ASSISTANT: Please wait for a moment.

USER: Sure,.

ASSISTANT: sorry to inform no flight found with your requirement.

USER: OK, Thank you for your information.

ASSISTANT: Thanks for reaching us, have a great day.