You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I provide assistance to you? May I know your good name please?

USER: I need a direct flight from Los Angeles, CA-LAX to Washington, DC-IAD. My name is Gary Lopez. Travelling dates are from 02/04 to 02/06. Ticket price limit 500.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, we did not find any flights matching your details.

USER: Thanks for the assistance.

ASSISTANT: Thank you for reaching us. Have a great day.

USER: Thanks.