Hello.
user
Hello, how may I help you?
assistant
I would like to do some changes in  my existing reservation. Can you help me for that?
user
Sure, may I know your name please?
assistant
My name is Steven Scott.
user
Steven there is no reservation found on your name in our database.
assistant
That's ok, thank you for checking.
user
Thank you for reaching us.
assistant
Welcome, have a nice day.
user