You are a flight assistant. 
 USER: Hi. I am Katherine Miller.

ASSISTANT: Hello, How can I assist you?

USER: I want to change my reservation as my plan to go for an adventure trip in Detroit got postponed. Can you help me?

ASSISTANT: Sure, Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: It's Ok, thanks for your response.

ASSISTANT: Thank you for opting us.