You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be your helping hand today?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, I am here to help you. May I know your good name please?

USER: Myself Joseph Carter.

ASSISTANT: Ok, please wait for some time, let me check with your existing reservation status.

USER: Ok.

ASSISTANT: We found reservation on your name, Can I know your new departure and arrival dates?

USER: I would like to fly on Dec 09 and return on Dec 11.

ASSISTANT: Ok, could you please provide your airport codes?

USER: My airport codes are LGA, OAK.

ASSISTANT: Do you need any lay by in between the journey?

USER: Yes, I need a single connection.

ASSISTANT: Ok, do you have any class preference?

USER: I don't have any preference.

ASSISTANT: May I know your airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Ok, at what times would you like to depart and arrival?

USER: I am comfortable with any timings.

ASSISTANT: We found a direct flight with AA airlines and a break in between the journey matches your schedule.

USER: You can proceed to booking.

ASSISTANT: Your ticket has been confirmed with flight number 1004.

USER: Thank you.

ASSISTANT: Thank you for reaching us.