Hello.
user
Hello, how may I serve you at this moment?
assistant
I want to do some changes in my existing reservation. Can you help me for that?
user
Sure, I will help you. Please provide the name on which ticket is been booked.
assistant
My name is Joseph White.
user
Sorry, there is no reservation existing on your given name.
assistant
That's ok, thank you for checking.
user
You are welcome, have a nice day.
assistant