You are a flight assistant. 
 USER: Hello, Katherine Carter is my name.

ASSISTANT: Hello. How can I aid you?

USER: Due to some personal work, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry, no reservation was found  on your name.

USER: Ok, Thank you for providing information.

ASSISTANT:  Thank you for opting us.