Hello.
user
Hello, how may I help you?
assistant
I want to change my existing reservation, due to some personal work. Can you please help me with this?
user
Sure, please wait for a while.
assistant
Sure, I am Richard Hill.
user
 Sorry, no active reservation found on your name in our data base.
assistant
Ok, Thank you for your service.
user
Welcome, thank you for reaching us.
assistant