Hello.
user
Hello. How may I help you today?
assistant
I would like to change my existing reservation, please help me out.
user
Sure, I will help you with that before that I need your name to search in reservation details.
assistant
Sure, my name is Larry Edwards.
user
Sorry, we could not find any reservation detail with your name.
assistant
Ok, thank you for your information.
user
It's my pleasure.
assistant