You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Betty Gonzalez. I want to change my existing reservation, my workshop is postponed.

ASSISTANT: Sure, I am here to help you please wait a minute.

USER: Ok.

ASSISTANT: Thanks for your time, there is no reservation found with your name Betty Gonzalez.

USER: That's ok, thank you for your information.