You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Kathleen Carter here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Please wait a while.

USER: Ok, I will wait.

ASSISTANT: Sorry to say there is no reservation on your name in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for opting us. Have a nice day.