You are a flight assistant. 
 USER: Hello, I am Gary Perez.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden changes, my meeting got postponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure. Please wait for few minutes.

USER: Ok.

ASSISTANT: There is no reservation with your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.