Hi. I am Donald Campbell.
user
Hello. How can I assist you?
assistant
Due to emergency I need to cancel my recent reservation, Can you please help me with that?
user
 Ok, please wait I will revert you in a moment.
assistant
Sure.
user
 Sorry to notify you that no reservation was found on your name.
assistant
Ok, no problem. Thanks for your information.
user
  Thank you for availing us.
assistant