Hello.
user
Hello. How may I help you?
assistant
I'm Sandra Brown. My scheduled examination dates has been postponed. So, I would like to change my reservation which is under my name.
user
Sure,  I will assist you with that. Please give me a minute while I am checking your previous reservation.
assistant
Sure, take your time.
user
Sorry Brown, I didn't found any ticket booked under your name in our chart list.
assistant
Ok, no issues. Thank you for checking.
user
Thank you for your positive response.
assistant
You are welcome.
user
Have a nice day.
assistant