Hello,.
user
 Hello, how can I best oblige you now?
assistant
I am Melissa Nelson. I want to change my existing reservation due to some issues, can you please help me with that?
user
Sure, please hold on.
assistant
Sure.
user
No reservation found on your name.
assistant
Ok, no issues. Thanks for your information.
user
Thank you for reaching us, have a nice day.
assistant