You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be there at your service?

USER: I want to fly to DC to visit Olympic National Park on 09/21 and my return date would be on 09/23, could you please help me in booking?

ASSISTANT: Sure, we are ecstatic to help you. May I know your take off and landing points?

USER: Sure, my source and destination airport codes are PHL and IAD.

ASSISTANT: Are you okay with connecting flight or you need a direct flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: I want to fly with the major airlines.

ASSISTANT: Before checking with the airlines, may I know your name please?

USER: I am Jessica Perez.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while, I will check the availability and get back to you.

USER: Sure.

ASSISTANT: We found a connecting flight with an Delta airlines, flight number:1015.

USER: Ok, please proceed with the booking.

ASSISTANT: Your flight ticket has been reserved with an economy class.

USER: Thank you for your kind service in booking.

ASSISTANT: Thank you for reaching us.