Hi.
user
Hello, how may I help you?
assistant
I want to change my existing reservation. Can you help me for that one?
user
Sure, may I know your name please?
assistant
Sure, Mark Clark here.
user
Ok, please wait for a moment.
assistant
Sure.
user
Sorry, there was no reservation found with your given name.
assistant
No issues, thank you for the information.
user
Thank you for opting us.
assistant