Hello.
user
Hello. How can I aid you?
assistant
I want to change an existing reservation, so please help me in changing the reservation.
user
Sure, We are here to help you. May I know your name?
assistant
Myself William Clark.
user
Give me a minute.
assistant
Ok.
user
 Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.
assistant
Not an issue. Thank you.
user
Thank you for reaching us.
assistant