You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Brenda Scott. I need to change my existing reservation as my exams got postponed some technical issues, can you please help me with that/.

ASSISTANT: Please wait a while. Sorry to say, there is no reservation on your name in our database.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us. Have a nice day.