You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Katherine Robinson here, due to sudden work I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT:  Sorry to inform you that no reservation was found on your name.

USER: Ok, not an issue. Thank you for choosing us.

ASSISTANT: Thank you for availing us.