Hello.
user
hello, How can I serve you now?
assistant
My name is Sarah Hernandez. I want to change my existing reservation, due to my exams has been postponed. Can you aid me to change it?
user
Ok. Wait for a while.
assistant
Sure.
user
Thanks for waiting. There is no reservation found with your name.
assistant
Ok, thanks for your quick response.
user
Thank you.
assistant