Hello. I am Frank Harris.
user
Hello, how may I aid you today?
assistant
  I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation.
user
Sure, we are perky to assist you. Please wait for a while, I will check with your reservation and revert to you.
assistant
Sure.
user
Sorry we did not find any reservation against your name.
assistant
No problem, thank you for your kind response.
user
Thank you for connecting with us.
assistant