Hi, Margaret Baker here.
user
Hello, how may I assist you?
assistant
Due to postponed of my exams so, I want to change my existing reservation, Can you please aid me?
user
Wait a while, I will be back and revert you.
assistant
Sure.
user
Baker, no reservation found with your name.
assistant
Fine, not an issue. Thanks for your information.
user
Thank you, have a nice day.
assistant