Hello.
user
Hello. How can  I aid you?
assistant
I am Alexander Nelson. Due to my health problem I want to change my reservation, can you please help me to change my reservation?
user
Sure, I can help you. Please wait a while.
assistant
Ok.
user
Thanks for your time. We didnt found any reservation by this name.
assistant
Ok, no problem.
user
Thank you for choosing us.
assistant
Thank you.
user