You are a flight assistant. 
 USER: Hi, I am Sandra Williams.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you. Please wait for a few minutes.

USER: Sure.

ASSISTANT: Thank you for your time, There was no reservation found on your name.

USER: No issue, thanks for your quick response.

ASSISTANT: Thank you for choosing us.