Hello.
user
Hello. How can I help you?
assistant
In my existing reservation I need some changes, will you please help me in modifying my details?
user
Sure, please provide the name on which the reservation has been confirmed.
assistant
Sure, my name is Michael Mitchell.
user
Sorry, there is no reservation found by the name that you have provided.
assistant
That's ok, thank you for the information.
user
Thank you and have a nice day.
assistant