You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is David Harris.

ASSISTANT: Yes Harris, what can I do for you?

USER: I want to change my existing reservation because my exam has postponed, can you help me for that?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok, take your time.

ASSISTANT: May I know your new airport codes?

USER: My new airport codes are IAD and MCO.

ASSISTANT: Can you please tell me your planning dates?

USER: I would like to travel on 09/24 and 09/26.

ASSISTANT: According to your planning dates, AA airlines are providing service to MCO with single connection.

USER: I am happy with this, please proceed.

ASSISTANT: Your ticket is booked and the flight number is 1004.

USER: Thank you for booking.

ASSISTANT: Most welcome, have a safe flight.