You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, can you let me know your name to check further?

USER: I am Michelle Johnson.

ASSISTANT: Your reservation has been found, can I know your new airport codes?

USER: I want to depart from PHL and need to land in DEN.

ASSISTANT: Ok, when are you willing to travel?

USER: I intend to travel on Nov 22 and need to return on Nov 24.

ASSISTANT: Do you want any benefits for your journey?

USER: Yes, I need a connecting flight and my return time must be in the morning.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Spirit Airlines offers a connecting flight with number 1011 for fare 200 with an economy class ticket which returns at  10:00AM, shall I proceed?

USER: Ok, please proceed for booking.

ASSISTANT: Your reservation is changed as new booking is confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.