Hi.
user
Hello. How may I help you?
assistant
I am Carol Adams. I need to change my existing reservation as my exams got postponed due to some technical issues, Can you please help me with that?
user
Please wait for a moment.
assistant
Sure.
user
 Sorry, there is no reservation matching with your name in our portal to make changes further.
assistant
Ok, no problem. Thanks for your information.
user
Thank you for reaching us.
assistant