You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Cynthia Harris.

ASSISTANT: How can I aid you at this moment?

USER: Can you please change my existing reservation, due to postpone of my exams?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check your reservation status.

USER: Sure.

ASSISTANT: Cynthia Harris, there is no active reservation found under your name in our database.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for opting us.