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

ASSISTANT: Hello, how can I help you?

USER: I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me to change it?

ASSISTANT: Sure, I am here to change your previos reservation. Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for approaching us.