Hello,.
user
Hello, how may I serve you?
assistant
I am Sandra Moore. I want to change my existing reservation  as our shooting sport got changed. Please help me out.
user
Ok, please wait, I will check your existing reservation in the database and revert you.
assistant
Ok.
user
Sorry, there is no reservation found on your name.
assistant
Ok, no problem that's fine. Thank you.
user
Thank you for contacting us, have a pleasant day.
assistant