You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. By what way shall I oblige you for the day?

USER: My name is Kathleen King, I want to change my existing reservation due to postpone of my business meeting.

ASSISTANT: Ok, I will help you in changing the reservation. Sorry, there was no reservation found on your name to change.

USER: Not an issue, thank you.

ASSISTANT: Thank you for your time with us.