Hi,.
user
Hello, how may I aid  you today?
assistant
I am Scott Davis. Please change my existing reservation.
user
Sure, we are glad to serve you. Please hold a moment, let me check your reservation with us and let you know.
assistant
Ok.
user
Thanks for your valuable time, sorry, unfortunately no reservation found with the provided name.
assistant
Thanks.
user
Thank you for reaching us, have a great day ahead.
assistant