You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Laura Green here. My plan to attend a function is postponed as of now, please change my existing reservation.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.

ASSISTANT: Have a great day.