You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Stephanie Carter want to change my reservation  due to postpone of my friend's wedding.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, we didn't found any reservation on your name.

USER: Thank you for sharing the information.

ASSISTANT: Thanks for choosing us.