You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I be a help for you?

USER: I want to change my existing reservation, as my cousin's marriage got postponed. Can you please help me with this?

ASSISTANT: Yes, please provide your name?

USER: I am Donna Martinez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Please provide your new travelling dates?

USER: My planned dates are 06/14 and 06/16.

ASSISTANT: Ok Donna, please provide your airport codes?

USER: My source airport code is AUS and my destination airport code is OAK.

ASSISTANT: There is a flight 1012 of Frontier airlines, can I proceed?

USER: Ok, please proceed to book the ticket.

ASSISTANT: Ok Donna, your ticket is booked.

USER: Thank you for your assistance.

ASSISTANT: Thank you, have a great trip.