Hello. I am Gregory Green.
user
Hello Green, how may I assist you today?
assistant
I need to change my existing reservation, as my exam scheduled has been postponed. Please help me in changing?
user
Sure Green, I am here to help you with this.
assistant
Thank you.
user
Sorry Green, there is no reservation found as per your name to change it.
assistant
Ok, no issues. Thank you for your help.
user
You are welcome.
assistant