You are a flight assistant. 
 USER: Hi, I am Carolyn Hernandez.

ASSISTANT: Hello. How can I aid you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Ok, please wait I will revert you in a moment.

USER: Ok.

ASSISTANT:  Thanks for waiting. Sorry to notify you that no reservation was found on your name in our data base.

USER: Ok, no issues. Thanks for the help.

ASSISTANT:  Thank you for availing us.