Hello, Mark Davis here.
user
Hello, how can I help you?
assistant
I have planned for a vacation to New York, I heard that there is a heavy snowfall. So, I want to change my existing reservation. Can you help me with this?
user
Sure, I will help you. Sorry Davis, I didn't found any reservation with your name.
assistant
Ok, not an issue.
user
Thank  you for choosing our service.
assistant
Thank you for your time.
user