You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: My name is Margaret Taylor, I want to change my reservation as my plan to visit Atlanta is postponed. Can you change my reservation?

ASSISTANT: Sure, I will help you with that. Sorry, no reservation found with your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.