Hi,.
user
Hello,. May I know your name?
assistant
I am Matthew Smith.
user
How can I aid you?
assistant
I want to change my existing reservation due to my friend's birthday party place has been changed. Can you help me in doing this?
user
Sure, I will assist you.
assistant
Thank you.
user
Please wait a while let me check and let you know you the status.
assistant
Sure.
user
Thank you for your time,  I have checked in reservation list to change your existing reservation details, but could not find any reservation with your name.
assistant
Ok, no issues. Thanks for your kind response.
user
Thank you for availing us. Have a nice day.
assistant