You are a flight assistant. 
 USER: Hi,. I am Donna Nelson.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Please book me a plane on 05/19.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: When are you willing to return your trip?

USER: I intend to return on 05/21.

ASSISTANT: Can I know your airport codes please?

USER: I will start my journey from New York JFK and  return from Phoenix, PHX.

ASSISTANT: How much you can afford for this journey?

USER: 200 is the budget for my trip.

ASSISTANT: Thank you for the details.

USER: Ok.

ASSISTANT: There is a flight available with SouthWest airline, flight number 1005 with fare 100 and a lay by.

USER: Proceed with my booking.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.