Hello.
user
Hello, how may I serve you today?
assistant
I am Charles Hall. Due to my health problem I want to change my active reservation, can you please help me to change my reservation?
user
Sure, I am here to help you.
assistant
Thank you.
user
Sorry Hall, there is no reservation found as per your name to change it.
assistant
Ok, no problem. Thank you.
user
You are welcome.
assistant