You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to Global Travel Agency. How can I help you?

USER: I want to book a direct flight to Chicago, IL - ORD.

ASSISTANT: Sure, can you provide me your travel dates?

USER: Sure, I had planned my trip in the month of April that is from 04/11 to 04/13.

ASSISTANT: May I know your destination airport code?

USER: Sure, my destination is Chicago, IL - ORD.

ASSISTANT: May I know your name please?

USER: Raymond Brown here.

ASSISTANT: Please provide us your source airport code.

USER: My source of journey is Washington DC - IAD.

ASSISTANT: Please wait, let me check for the available flights on 04/11 to ORD.

USER: Ok.

ASSISTANT: There is a service available on this route from Delta airlines, shall I book your ticket?

USER: Yes, please book it.

ASSISTANT: Your ticket is booked and your flight number is 1010.

USER: Thank you for your services.

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