Hello.
user
Hello. How can I help you?
assistant
My name is Michael Lee. Due to sudden change in my plan I want to change my existing reservation.
user
OK, please give me a minute so that I can check with your details.
assistant
OK.
user
Sorry, there is no existing reservation found.
assistant
It's OK. Thank you for your quick response.
user
Thank you for choosing us. Have a good day.
assistant