Hi, I am Alexander Lewis.
user
Hello,. How can I abet you today?
assistant
 I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation.
user
Ok.
assistant
Can you please change my existing reservation?
user
Sure, we are here to aid you.
assistant
Thank you.
user
Please, wait.
assistant
Sure.
user
Thanks for waiting,. There is no reservation found on your name in our database.
assistant
Ok, it's not a problem.
user
Thank you for opting us.
assistant
Thanks for your prompt response.
user