Hello.
user
Hello, how may I help you?
assistant
Gregory Baker here. I would like to change my existing reservation.
user
Sure, I am glad to assist you. Please be on hold for a moment to check it.
assistant
 Sure.
user
Thank you for waiting, there is no reservation found for the user name to change it.
assistant
No issue, thank you for your help.
user
You are most welcome and have a nice day.
assistant