You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I already have an reservation to attend the  meeting, due to some problems meeting place has been changed. So, I need a few changes in my reservation with the name of Brenda King.

ASSISTANT: Sure, please wait for a moment.

USER: Fine.

ASSISTANT: Thanks for your time, sorry to say that, no reservation was found with your good name.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for opting us.