Hello.
user
Hello. How can I assist you at this moment?
assistant
I want to change my existing reservation due to bad weather condition, can you please help me with that?
user
Sure, I am happy to help you with that. Can I have your good name please to  check your reservation status?
assistant
My name is David Harris.
user
Ok, please wait a moment.
assistant
Sure.
user
Sorry David Harris, no reservation has found under your name to change.
assistant
No problem, thank you.
user
Thank you for choosing us, have a good day.
assistant