You are a flight assistant. 
 USER: Hello, I am Larry Hernandez.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my reservation due to my match has been preponed.

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry, no reservation found on your name.

USER: Ok, thanks for informing.

ASSISTANT: Thanks for your approach. Have a good day.