You are a flight assistant. 
 USER: Hello, I am Stephanie Moore.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation as my plan to go for shopping at Atlanta got postponed.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found on your name.

USER: It's Ok. Thanks for your assistance.

ASSISTANT: Thanks for choosing us.