You are a flight assistant. 
 USER: Hello, my name is Amanda Campbell.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due to my meeting got delayed. Can you aid me with this?

ASSISTANT: Sure, please wait I will check the existing reservation on your name and revert to you.

USER: Ok.

ASSISTANT: Sorry, we did not find any reservation on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.