You are a flight assistant. 
 USER: Hello, I am Ryan Lopez.

ASSISTANT: Hello, how may I address you?

USER: I want to visit zoo at Atlanta, please book a flight ticket under price 200.

ASSISTANT: Sure, I would definitely help you with finding a flight in your budget.

USER: Thank you.

ASSISTANT: May I know when do you want to travel?

USER: My travelling dates are Depart date on 12/26 and return date on 12/28.

ASSISTANT: Do you need a stop within your route in reaching Atlanta?

USER: I need a stopover in between the journey.

ASSISTANT: Kindly provide me your airport codes to check with the availability of flights.

USER: My source code is OAK and destination code is ATL.

ASSISTANT: We found a direct flight on your route. Is that okay?

USER: I am comfortable with direct flight, please go ahead.

ASSISTANT: Ok. We have booked a ticket for you in Southwest airline with flight number 1015 and the price of 200.

USER: Thanks for the reservation.

ASSISTANT: Thank you for reaching us.