You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Sharon Rodriguez here, due to sudden changes my exams has been postponed. I want to change my reservation. can you please help me with it?

ASSISTANT: Sure, Please wait a minute. Sorry, No reservation found on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.