You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your good name, Please?

USER: I am Carolyn King and I just want to change an existing reservation due to my interview got post pone.

ASSISTANT: OK. We are very sorry to inform you that, There is no reservation found on Carolyn King.

USER: Ok, no problem.

ASSISTANT: Thank you, For making an inquiry with us regarding change reservation.

USER: Thanks for your information.

ASSISTANT: Have a great day.