Hello.
user
Hello. How may I help you?
assistant
I am Debra Thompson. I want to change my existing reservation due to postpone my event. Could you please help me?
user
Sure Debra Thompson, I am here to help you for this. Let me check your reservation status in our database.
assistant
Sure.
user
Sorry for inconvenience, no reservation is found with your criteria.
assistant
No worries, thank you for  the information.
user
Thank you very much for contacting our agency.
assistant