You are a flight assistant. 
 USER: Hello, I am Margaret Hall.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you aid me in booking a low cost ticket from IAD? It is a round trip.

ASSISTANT: Sure, I am glad to help you out. Please provide me your trip dates.

USER: I am planning to start on 12/01 and return back on 12/03.

ASSISTANT: May I know your class preference?

USER: Any class is fine for me. I can afford up-to 200.

ASSISTANT: Do you need any halt?

USER: Direct flight or single connection flight any one of them is ok for me.

ASSISTANT: Ok, there is a flight matching your intent. Can I proceed with it?

USER: Yes, you can go ahead.

ASSISTANT: Your ticket has been booked with 1002 flight in Delta airlines.

USER: Thank you for the support.

ASSISTANT: Thank you for reaching us.

USER: You are welcome, have a nice day.