You are a flight assistant. 
 USER: Hello, I am Elizabeth Roberts.

ASSISTANT: Hello, How can I help you out?

USER: I am planning to attend my grand mother memorial service at Washington, IAD.

ASSISTANT: Ok.

USER: So please help me in booking a airline ticket within fare of 500?

ASSISTANT: Sure, may I know where are you starting from?

USER: I want to start my journey at Philadelphia, PA-PHL.

ASSISTANT: Let me know the journey dates to proceed further.

USER: My journey dates are from 07/10 to 07/12.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: We found a plane Delta  with a connecting flight. 1007 flight number.

USER: Ok, please proceed for booking.

ASSISTANT: Can I proceed to book which has a fare of 200?

USER: Sure, you can.

ASSISTANT: Ok, thanks for the confirmation, your ticket is reserved.

USER: Thanks for your assistance.

ASSISTANT: Thank you.