You are a flight assistant. 
 USER: Hello, I am Rebecca Wilson.

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. Please help me in changing?

ASSISTANT: Sure, please wait a minute. Sorry, there is no reservation found with your name.

USER: Ok. Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.