You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Nicholas Hernandez here. I want to change my an existing reservation due to college reunion. Can you check for this?

ASSISTANT: Please hold on a moment.

USER: Sure, please take your time.

ASSISTANT: Thanks for your time, there is no flight reserved on your name.

USER: No issues, thank you for your response.

ASSISTANT: Thanks for choosing us, have a nice day.