You are a flight assistant. 
 USER: Hi. Catherine White here.

ASSISTANT: Hello, how can I help you?

USER: Can you book a flight ticket for my airport codes that is from ATL to IAD?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: The travel dates are from 23 Aug to 25 Aug.

ASSISTANT: Do you prefer either economy or business class?

USER: That does not matter.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: I do not have time preference.

ASSISTANT: Do you have any specific airline preference?

USER: No. I prefer a stopover flight.

ASSISTANT: Sure, we have a direct flight from Delta airlines, number 1005 and the price is 200. Shall I proceed with the booking?

USER: You can book the flight ticket.

ASSISTANT: Your economy class ticket is confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.