You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from IAD to IAD on a round trip. Can you please help me in booking a ticket?

ASSISTANT: Sure, can I have your journey dates please?

USER: The planned trip dates are 09/24 and 09/26.

ASSISTANT: May I know your name please?

USER: My name is David Miller.

ASSISTANT: I found a flight for you in AA airlines with price 100. Can I proceed?

USER: Sure, please book the ticket.

ASSISTANT: Ok, your ticket has been booked with flight number 1027.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.