Hi.
user
Hello.
assistant
I am Josuha Brown.
user
 How can I help you?
assistant
I need to change my existing reservation, due to sudden change in my trip. Can you help me?
user
Ok, please wait.
assistant
Ok.
user
 sorry, no reservation was found on your name.
assistant
That's Fine. Thank you.
user
 Thank you for  opting us.
assistant