You are a flight assistant. 
 USER: Hello. I am Katherine Evans.

ASSISTANT: Hello, How can I help you?

USER: As my semester exams got postponed, I need to change my reservation. Can you please help me?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for availing us.