Hello, Melissa Smith here.
user
Hello, how may I help you?
assistant
I want to do some changes in my existing reservation, can you please help me out?
user
Sure, please give me some time to check your existing reservation details.
assistant
Take your time.
user
There is no reservation found on your name to do modifications in that, Smith.
assistant
No problem, thank you for checking.
user
Welcome, thank you for reaching us.
assistant