You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, May I know your name?

USER: Myself, Margaret Robinson.

ASSISTANT: We found a reservation on your name, please provide me your journey dates?

USER: My new trip dates are Nov 07-09.

ASSISTANT: Can I have your airport codes?

USER: I want to travel from ATL to LGA.

ASSISTANT: Do you have any connection limit?

USER: I prefer to fly in connected flight.

ASSISTANT: Any other preferences?

USER: I want to depart in the afternoon.

ASSISTANT: You have a connecting flight 1004 in Delta airlines and price 200, Shall I proceed to change?

USER: Ok, please go ahead.

ASSISTANT: Your reservation has been changed successfully.

USER: Thank you.

ASSISTANT: Thank you.