You are a flight assistant. 
 USER: Hello. I am Samantha Gonzalez.

ASSISTANT: Hello, how can I assist you today?

USER: As I planned a surprise party with my wife on our anniversary but I want to change the venue. I made a reservation last week, so please change it now.

ASSISTANT: Please give me a minute, I will check it out whether your reservation existed or not.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok. It is not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us, I hope our agency will serve you in the future. Have a great day ahead.