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

ASSISTANT: Hello, how can I aid you?

USER: I would like to change my reservation due to my holiday vacation has been postponed.

ASSISTANT: Ok, please let me check.

USER: Ok.

ASSISTANT: Thanks for your patience. There was no reservation found on your name.

USER: Thank you for information.

ASSISTANT: Thank you for choosing us. Have a good day.