Hello.
user
Hello, how may I assist you today?
assistant
I am Karen Perez. I have recently reserved a flight ticket from Las Vegas, now I am not willing to go near to my destination place. So can you please help me in changing my travelling dates to next week?
user
Sure, I am here to help you. Please wait for sometime to check the status of your reservation.
assistant
Ok, sure take your own time.
user
Thank you for waiting. Sorry to say that, no  active reservation was found on your name in our database.
assistant
Ok, fine thank you for checking.
user
Thank you for choosing us.
assistant