Hello.
user
Hello, how may I serve you?
assistant
I am Robert Roberts. Due to my health problem I want to change my reservation, can you please help me that?
user
Sure, let me check the current status and get back to you.
assistant
Ok.
user
We are sorry to inform you that, we did not find any reservation against your name.
assistant
Ok, no problem. Thank you.
user
Thank you for choosing us.
assistant