You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you now?

USER: I have to visit Washington Union Station in Washington, can you please help me to reserve a plane ticket from Philadelphia?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: Thank you. My preferable journey dates are June 25 and June 27.

ASSISTANT: Ok, may I know your regional airport codes for booking?

USER: The regional airport codes are PHL and DCA.

ASSISTANT: Are you ok with connecting flight?

USER: I am looking for a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, thanks for asking.

ASSISTANT: May I know your name to book the flight ticket?

USER: My name is Edward Hall.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, take your time. I will wait for your response.

ASSISTANT: Based on your information, I have found a flight with 1 connection having with the fare of 100 provided by United Airlines in economy class. Are you ok with this flight?

USER: I am ok with this flight, please do proceed with the flight ticket booking.

ASSISTANT: Ok, your ticket has been confirmed in flight number 1017.

USER: Thank you so much for your assistance.

ASSISTANT: Thank you for approaching us, have a great journey.

USER: Most welcome.