Hello. I am Gary Green.
user
Hello, how can I best serve you?
assistant
I want to change my reservation due to sudden change in my schedule. Help me to change my reservation.
user
Ok. Please wait for a moment.
assistant
Sure.
user
Thanks for waiting, we hardly tried to find your reservation but couldn't found any reservation with your name.
assistant
Thank you for your response.
user
Thanks for approaching us. Hope to serve you again.
assistant