You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I would like to travel DC - IAD to visit my grand mother home. Can you help me out of it?

ASSISTANT: That's great, provide me your travel dates?

USER: My travelling dates are 05/19 and 05/21.

ASSISTANT: May I know your source airport code.

USER: I am Cynthia Garcia, from NC - CLT.

ASSISTANT: Sure, let me check.

USER: Ok.

ASSISTANT: I have found a flight in Delta airline, shall I proceed with the booking?

USER: Yes, book it for me.

ASSISTANT: Sure. Your ticket is confirmed with the flight number 1028.

USER: Ok, thank you for your services.

ASSISTANT: Thank you for reaching us, have a safe journey.