Hello. Gary Collins here.
user
Hello, how may I assist you at this moment?
assistant
 I need to change my existing reservation as my plan to go for an historical tour got postponed. Can you please check if my reservation is active or not? if it is active, please change it.
user
Sure, I am glad to help you with that.
assistant
Thank you.
user
Please give me a moment to check your previous reservation status.
assistant
Ok, sure.
user
Sorry, there is no reservation found on your name in our data base.
assistant
Ok, not a problem. Thank you for the information.
user
Thank you for reaching us.
assistant