You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist 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, Gregory Phillips.

ASSISTANT: We found a reservation on your name, can you please share your travel dates?

USER: My new trip dates are Feb 22-24.

ASSISTANT: May I know your airport codes?

USER: I would like to travel from OAK to DEN.

ASSISTANT: Do you have any specifications?

USER: I prefer a connected flight.

ASSISTANT: We found an airline Southwest with flight 1006 having a fare 100 with stopover.

USER: Ok, please go ahead.

ASSISTANT: Your reservation has been changed.

USER: Thank you for changing.

ASSISTANT: Thank you.