Hello, I am Sandra Mitchell.
user
Hello. How can I help you?
assistant
As my manager did not approve my leave, I would like to change my reservation.
user
Sure, I will help you to change your reservation.
assistant
Thank you.
user
Sorry, there is no reservation found on your name to change your reservation.
assistant
That's ok, thank you for checking.
user
Welcome. Thank you for choosing us.
assistant
Welcome.
user