Hello.
user
Hello, how can I help you today?
assistant
I want to change my reservation due to some issues, can you help me in doing that?
user
Sure, I am here to help you with that, can I know your good name to proceed further?
assistant
I am Christine Williams.
user
  I am very sorry to inform you that there is no reservation found under your name in our database.
assistant
Ok, no issues. Thank you for the information.
user
 Thank you for reaching us.
assistant