You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Justin Brown here. Can you please book me a connecting flight from IAD to PHL?

ASSISTANT: Sure, I am oblige to assist you in flight ticket booking. May I know your preferable travel dates?

USER: Sure, my planned trip dates are from 07/26 to 07/28.

ASSISTANT: Please be on hold for a moment. Thanks for your information, based on your request there is a flight with airline Delta and fare of the flight is 100, shall I proceed with this flight?

USER: Ok, please proceed.

ASSISTANT: Ok, your flight ticket booking is done in 1019 flight to reach your destination.

USER: Thank you for booking.

ASSISTANT: You are most welcome and have a great journey.