Hello, Karen Thomas here.
user
Hello. How can I help you?
assistant
I planned to visit Oakland with my friend, but he is occupied with some unplanned work. So I want to change my existing reservation.
user
Sure, I will help you to change your reservation. Wait a moment.
assistant
Sure, take your time.
user
Sorry, there is no reservation found under your name.
assistant
Thank you.
user
Welcome.
assistant