Hello.
user
Hello. How can I aid you?
assistant
I am William Martin. I need to modify my reservation, can you help me out please?
user
Sure, I am happy to help you. Let  me check your reservation status in our database.
assistant
Ok, take your own time.
user
Martin, I did not find any reservation under your name in our database.
assistant
That's ok, no problem. Thank you for your information.
user
You are welcome and thank you for choosing us.
assistant