Hello. I am James Adams.
user
Hello, how may I serve you  at this moment?
assistant
Can you please change my existing reservation as my plan to meet my friend got postponed?
user
Sure, we are here to help you.
assistant
Thank you.
user
Please wait for a while.
assistant
Sure.
user
Sorry, we could not find any reservation with your name.
assistant
Ok, no problem. Thank you for the information.
user
Thank you for choosing us.
assistant