Hello.
user
Hello, may I know your name?
assistant
My name is Frank Campbell,  I want to change my existing reservation. So can you please help me out?
user
Ok Frank, be on hold for a moment to check it. Sorry Frank, there is no reservation found in my data based on your requested name.
assistant
Ok, that's not a problem.
user
Ok, thank you for contacting us.
assistant
Anyways, thank you for your help.
user
Your welcome.
assistant