You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER:  I am Ryan Roberts, I want to change my existing reservation as my spouse office meeting got postponed.

ASSISTANT: OK, please wait I will let you know.

USER: OK, sure.

ASSISTANT: Thank you for waiting. Sorry, no reservation is found on your name.

USER: OK, no issues. Thank you for the information.