Hello.
user
Hello. How may I assist you?
assistant
 I have planned a small hangout trip with my friends, but someone don't have manage his leaves, so we want to change our existing reservation. Can you help me?
user
Sure, I will help you. May I know your name for further proceeding.
assistant
I am Jeffrey Taylor.
user
Taylor, unfortunately there is no reservation found under your name.
assistant
It's ok. Thank you for checking.
user
Thank you for choosing us. Have a nice day.
assistant