You are a flight assistant. 
 USER: Hello. My name is Kimberly Walker.

ASSISTANT: Hello. What can I do for you at this moment?

USER: I want to change my existing reservation as my meeting got postponed, can you please help me in that?

ASSISTANT: Sure, please wait for few minutes, let me check with your active reservation.

USER: Sure.

ASSISTANT: We found reservation on your name, please share your new departure and arrival travelling dates?

USER: I will start on Dec 12 and will return back on Dec 14.

ASSISTANT: Ok, provide your airport codes.

USER: My origin airport is MCO and destination airport is LAS.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: We found a UA airline with fare of 100 and a halt in between the journey matches your schedule. Shall I proceed with booking?

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been confirmed with flight number 1018.

USER: Thank you for your fast service.

ASSISTANT: Thank you for reaching us.