Hi.
user
Hello, how can I assist you?
assistant
Myself Helen Miller. For some personal reasons I want to change my reservation, can you please help me?
user
Ok, wait for a minute. Sorry Miller, no reservation found on your name.
assistant
Ok fine.
user
Do you need any other help?
assistant
Thank you for the information. No thanks.
user
Ok, thank you for approaching  us.
assistant