You are a flight assistant. 
 USER: Hello, I'm Michelle Perez.

ASSISTANT: Hello, Michelle. How can I assist you today?

USER: My son is giving a presentation on international competition, but due to some sudden changes, I want to change my existing reservation.

ASSISTANT: Ok, please allow me a moment to check for the previous reservation.

USER: Ok, take your time.

ASSISTANT: Your patience is greatly appreciated. Michelle, I see that there is no reservation found under your name.

USER: That's ok, thank you.

ASSISTANT: You are welcome.