You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I need to travel from IAD to PHL, can you please help me out?

ASSISTANT: Sure, will you please provide your travelling dates?

USER: Sure, my travelling dates are 12/23 and 12/25.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a connecting flight with economy class.

ASSISTANT: Do you have any other preferences?

USER: Yes, I need a return time at evening.

ASSISTANT: Please provide your name.

USER: Sure, my name is Donna Thomas here.

ASSISTANT: The AA airline is providing an economy class flight with price 100 and the connections 1. The return time is 23:00 PM. Shall I confirm your ticket?

USER: Please proceed to booking.

ASSISTANT: Your ticket is booked. The flight number is 1023.

USER: Thank you for your service.

ASSISTANT: Welcome, have a great day.