Hello.
user
Hello, how may I assist you today?
assistant
I want to do some changes i my existing reservation. Can you help me for that?
user
Sure, may I  know your good name for further process?
assistant
My name is Mark Adams.
user
Please wait for a moment.
assistant
Sure, I will wait for your response.
user
Sorry to inform you that, there is no reservation found as per your name in our database.
assistant
That's ok, thank you for checking.
user
Thank you for reaching us with a query.
assistant